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Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Seventeen endogenous fungi were isolated and identified from the litter leaves of the Pinus massoniana forest in the western Hunan region. Four dominant endogenous fungi were selected to inoculate litter leaves as decomposition materials in order to analyze the impact on litter decomposition and changes in microbial activity. [ Method ] The endogenous fungi were inoculated to litters and then placed in a field test site by litter bag method for one year. [ Result] Compared with the blank control group, endogenous fungi could promote litter decomposition. During the decomposition process, different endogenous fungi have different ability to decompose litter leaves. The mass loss rate of the mixed treatment group is higher than that of the single treatment group, and the Pestalotiopsis neglecta and Abortiporus biennis treatment group has the highest weight loss rate. With the increase of time, the amount of C02 released by the microorganisms decreased; the microbial activities of different treatment groups also differed in different decomposition periods, of which the Cl, Cx,,g-glucoside and laccase enzyme of the mixed treatment group of P. neglecta and A. biennis had the highest activities, which was consistent with the response to mass loss. [ Conclusion ] The four species of endogenous fungi colonization promoted the litter decomposition and microbial activity [ABSTRACT FROM AUTHOR]

The selenite absorption and accumulation effects of two sweetpotato cultivars with different flesh colors were analyzed to provide reference for the exploration of safe and efficient selenium-rich sweetpotato production technology and the development of seleniumrich sweetpotato industry in Guangxi. [Method] With orange-flesh Guishu No. 10 and purple-flesh Guizishu No. 1 as experimental materials, the agronomic characters, tuber yield and quality of sweetpotato plants treated with selenite at different concentrations ( 0, 0. 20, 0. 40 and 0. 80 mg/kg) in potted soil (Se 0, Se 0. 2, Se 0. 4 and Se 0. 8, respectively) were determined. Furthermore, the accumulation and distribution of selenite in organs of different sweet potato cultivars with different flesh colors were analyzed. [Result] Application of 0. 20 and 0. 40 mg/ kg selenite could significantly increase the yield of sweetpotato per plant ( P < 0. 05, the same as below) . Selenite at different concentrations had no significant effect on the vine length, branch number, number of potatoes per plant, soluble sugar content, protein content and carotene content of the same sweet potato cultivar ( P > 0. 05 ) . However, the content of proanthocyanidins in Guizishu No. 1 treated by Se 0. 2, Se 0. 4 and Se 0. 8 was lower than that of the control, and the content of proanthocyanidins in Se 0. 8 treatment was significantly lower than that of the control by 23. 08 % . The selenium content of fiber root, stem, tuber root and leaf of the plant was higher than that of the control group at different growth stages. The order of selenium accumulation and distribution rate of organs of different varieties was tuber root >fiber root > leaf > stem. Organic selenium dominated the selenium m01phology in the tuber root of the two kinds of sweetpotato with different flesh colors, but no tetravalent selenium and hexavalent selenium were detected. Among them, the proportion of SeCys2 in organic selenium content was significantly higher than that of SeMeCys. The ratio of SeCys2 to organic selenium content of Guishu No. 10 increased with the increase of exogenous selenite concentration, while the ratio of SeCys2 to organic selenium content of Guizishu No. 1 decreased with the increase of exogenous selenite concentration. [Conclusion ] The selenium forms of Guishu No. 10 and Guizishu No. 1 were SeCys2 and SeMeCys, and the content of SeCys2 is obviously higher than that of SeMeCys. When 0. 20 and 0. 40 mglkg selenite were used to the soil, the yield of tuber root was higher. Meanwhile the ratio of SeCys2 content to organic selenium content in Guishu No. 10 was higher than Guizishu No. 1 when applying 0. 80 mglkg selenite. In production practice, suitable concentration of exogenous selenium should be applied according to the characteristics of sweet potato varieties. [ABSTRACT FROM AUTHOR]

【Objective】The present paper aimed to solve the problem of greenhouse gas emissions from livestock manure,By adding modifiers and other measures to reduce greenhouse gas emissions. 【Method】A laboratory experiment of simulated storage, using cattle manure and cattle urine as raw materials, was conducted for 30 days. This experiment monitored the dynamic changes of CO2 and CH4 emissions during cattle manure storage, and the effects of differentadditives on CO2 and CH4 emissions from cattle manure were also studied. These additives included 2 % zinc sulfate, 1 % magnesium hydroxide combined with 4 % phosphoric acid, 10 % calcium chloride, and 1 % zeolite. 【Result】The result demonstrated that the peak value of CO2 emission flux of CK（control check） treatment that was only added with cattle manure and cattle urine appeared on the 8th day, which was 20.590 μmol·m-2·s-1, and the peak value of the CH4 emission flux occurred on the 24th day, which was 0.735 μmol·m-2·s-1. The peak period of CO2 emission from zinc sulfate treatment was delayed for 22 days, and the CO2 emission peaks of magnesium hydroxide combined with phosphoric acid, calcium chloride, and zeolite treatments appeared 2 to 3 days in advance. For CH4 emissions, the peaks of zinc sulfate and calcium chloride treatments appeared 15 and 17 days early, respectively, the peak period of magnesium hydroxide combined with phosphoric acid treatment occurred 3 days later, and the peak of zeolite treatment appeared on the same day as CK treatment. Compared with CK treatment, the average CH4 emission flux of magnesium hydroxide combined with phosphoric acid treatment decreased by 22.9 %, but the average CO2 emission flux increased by 4.5 %; the average CH4 emission fluxes were reduced by 28.0 %, 90.4 %, and 5.1 % under the treatments of zinc sulfate, calcium chloride and zeolite, respectively, and the average CO2 emissionfluxes were reduced by 47.9 %, 83.1 %, and 1.7 % under the same treatments, respectively. 【Conclusion】The conclusion can be drawn that magnesium hydroxide combined with phosphoric acid should not be used as an additive classified into emission reduction measures of greenhouse gas from cattle manure, while zinc sulfate and zeolite are not as effective as calcium chloride for reducing CO2 and CH4 emissions from cattle manure. Therefore, calcium chloride is an excellent additive which can be added to cattle manure, with reducing greenhouse gas emissions. [ABSTRACT FROM AUTHOR]

[Objective] To provide a reference for reducing the cadmium accumulation of rice in limestone areas, the correlation coefficient between the soil bioavailable cadmium and cadmium enrichment coefficient of each part of the rice and soil properties in Guangxi Province was investigated. [Method]65 pairs of soil and rice cultivar(Y-Liangyou) were collected from paddy fields in Guangxi Province to investigate the relationship among ratios of paddy soil bioavailahle/total cadmium and brown rice cadmium concentrations and paddy soil properties factors, and the main factors which influence bioavailahle cadmium and cadmium concentrations in brown rice. [Result]The cadmium excess rate of soil was 67. 69 % and the brown rice excess rate was 41.54 %. Soil cadmium effectiveness under the influence of Fe, Mn forms. Both bio-available cadmium and total cadmium concentrations in paddy soil were significantly negatively correlated with soil total iron, manganese concentrations , while positively correlated with hioavailahle iron concentrations. pH, organic matter, exchangeable calcium and total iron and total manganese could significant effect the cadmium enrichment capability of rice. Gadmium enrichment coefficient of brown rice was significantly negatively correlated with pH, exchangeable calcium and was extremely significantly negative correlation with organic matter, iron, manganese. In addition, total manganese and hioavailahle manganese concentrations were the main impact factors affected soil hioavailahle cadmium. It is made that the correlation ratio analysis of hioavailahle cadmium/total cadmium, total manganese and hioavailahle manganese concentrations by use of univariate linear regression equation ; Ratio (bioavailahle cadmium/ total cadmium) =0.491 - 0. 167 × C(total manganese) + 0. 004 × C(bioavailahle manganese). Brown rice cadmium intake was influenced by total manganese concentrations, the correlation analysis of enrichment coefficient of biown rice and exchangeable calcium and total manganese concentrations; Ratio(enrichment coefficient of brown rice) =0.493 -0.006 × C(exchangeable calcium) -0. 156 × C(total manganese). [Conclusion] The over-limit rate of brown rice was lower than soil in Guangxi Province. The manganese speciation was the most critical factors that affected the effectiveness of soil cadmium, while the total manganese and exchange calcium content of soil were mostly the main factors that reduced the Cd concentration in rice in Guangxi Province. [ABSTRACT FROM AUTHOR]

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The genetic diversity of 18 phenotype characters of 53 Frutescens germplasm resources was analyzed by the clustering and principal component analysis methods to provide the scientific basis for identification, taxonomy and genetic improvement application of Perilla Frutescens germplasm resources in Guizhou. Results: There is wide genetic diversity in Frutescens germplasm resources and are significant positive correlations or negative correlations between different characters of Frutescens germplasm resources. The variation coefficient of six quantitative characters of 53 Frutescens germplasm resources is 24.12 % - 66.49 % . The variation coefficient of total panicles per plant and nodes of main stem is maximum (6 6 .4 9 % ) and minimum(24. 12 % ) respectively. 53 Frutescens germplasm resources are divided into groups by clustering analysis based on different phenotype. Group I belongs to the ornamental type with late maturity, umbrella plant type, deep leaf color and less seed weight per plant, group II is of early maturity, tower plant type and big seed and group III is the middle group between early maturity type and late maturity type, which reflects the genetic relationship among three groups basically. The principal component analysis shows that the accumulative contribution rate of former 7 principal components is up to 84. 79 % . The load value of different principal components reflects the breeding selection potential of major characters. [ABSTRACT FROM AUTHOR]

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Four hundred and seventy-six genotypes of sweetpotato germplasms were analyzed for genetic diversity based on the morphological markers in this study. The results showed that there were obvious differences among 17 morphological characters in different germplasms, the average coefficient of variation was 40.14%, and the average diversity index was 0. 6012, and it declared that they had a great potential variation. The diversity index of the group of sweetpotato germplasms resources in Guangxi was 88. 24% higher than the whole group, it indicated that which had a higher genetic diversity. In the domestic three big groups and the foreign group, the average coefficient of variation of overseas group is maximum, that should be protected and utilized. The first nine principal components of the contribution rate was 72.41%, it indicated that the first nine principal components contained all morphological marker to 72.41% of the content. At the same time, it could offer some references to variety breeding. [ABSTRACT FROM AUTHOR]