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Copyright of Forest Research is the property of Forest Research Editorial Office 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.)

[Objective] By studying growth and plant diversity characteristics of different Eucalyptus plantations mixed forests could provide reference for the scientific management of Eucalyptus mixed forests. [Method] A total of 4 Eucalyptus stands in the 18-year-old (Eucalyptus and Quercus griffithii mixed plantation, Eucalyptus and CastOJJ.opsis hystrix mixed plantation, Eucalyptus and Alnus forrnosana mixed plantation, Eucalyptus plantation ) in Gaofeng forest farm of Guangxi as the research plots, the growth indexes such as height, height under branches, individual volume and stand volume, as well as the species composition, important values and diversity index of shrub and grass under the forest were investigated. [ Result] The diameter at breast height, height and individual volume growth of Eucalyptus and C. hystrix mixed plantation were higher than that in Eucalyptus plantation. The Eucalyptus and C. hystrix mixed plantation can promote the growth of Eucalyptus. The total volume of four Eucalyptus plantations were Eucalyptus and C. hystrix mixed plantation(373. 733 m3 / hm2 ),Eucalyptus and Q. griffithii mixed plantation ( 366. 042 m3 / hm2 ), Eucalyptus plantation ( 339. 860 m3 / hm2 ), Eucalyptus and A. formosana mixed plantation ( 249. 041 m3 / hm2 ) . There were no significantly difference in the total volume total among Eucalyptus and A. formosana mixed plantation, Eucalyptus and Q. griffithii mixed plantation and Eucalyptus plantation( ? > 0. 05),but they were extremely significantly greater than Eucalyptus and A. fomwsana mixed plantation(P <0. 01) . The results show that there were 139 species in 112 genera of 69 families of undergrowth plants in 4 Eucalyptus stands ;96 species in 77 genera of 47 families in the shrub layer,43 species in 35 genera of 22 families in the herb layer. The species number and species richness index of herb layer were lower than those of shrub layer, Euphorbiaceae and Gramineae are the most species in the shrub and herb layer respectively. There were 95 species in 82 genera of 58 families of undergrowth plants in Eucalyptus and C. hystrix mixed plantation. The Jaccard coefficient among Eucalyptus and C. hystrix mixed plantation, Eucalyptus and A. fornwsana mixed plantation and Eucalyptus plantation, which had higher Jaccard coefficient than that of Eucalyptus and Q. griffithii mixed plantation. Different mixed modes of Eucalyptus had a significant impact on understory plant diversity, and plant diversity per stand large to small was as follows: Eucalyptus and C. hystrix mixed plantation >Eucalyptus plantation >Eucalyptus and A. fornwsana mixed plantation > Eucalyptus >Eucalyptus and Q. griffithii mixed plantation. [Conclusion] According to the comparative of stand growth and plant diversity, Eucalyptus and C. hystrix mixed plantation can be popularized as a reference model of Eucalyptus mixed plantation in the future since it has advantages in Eucalyptus growth, stand accumulation, total and understory diversity. [ABSTRACT FROM AUTHOR]

In order to understand the characteristics of nutrient changes in the needles and roots of Masson pine plantations with different ages and densities, this article selected four forest ages (young forest, middle-age forest, mature forest and overmature forest) in Zhenlong Forest Farm, Hengxian County, Nanning City, Guangxi. Forest) and four densities (low-density forest, medium-low-density forest, medium-high-density forest and high-density forest) Masson pine forests, a total of eight forest stands, analyzed the CNP content and ratio of masson pine needles and roots and their relationship with soil nutrients relation. The results showed that: (1) The N:P ratio of masson pine needles in all age forests and density forests was greater than 16, indicating that masson pine is obviously restricted by P in this area, and young forests are more obvious. (2) The C content in the needles of Masson pine gradually increases and then decreases with the growth of the forest age. The content of N and P shows a weak downward trend, resulting in a slight upward trend in the C:N ratio, C:P ratio and N:P ratio, but no Reached a significant level; the root C content, P content and C:N ratio gradually increased, and the N content, C:P ratio and N:P ratio were U-shaped and both were the largest in young forests; needles and roots were in mature forests All stages have higher P content and highest C content. (3) The masson pine needles in the medium-density forest have higher C and N content and the highest P content. The C:N ratio is lower and the C:P ratio and N:P ratio are the lowest; the root system has higher CN and P content, and C:N ratio C:P ratio and N:P ratio are lower. (4) The root nutrients of Masson pine, especially P content, change more drastically between different age forests and different density forests than needles, and its correlation with soil nutrients is stronger than that of needles. The above results show that the Pinus massoniana plantation is restricted by P. Strengthening the management of P fertilizer in young forests and choosing the appropriate forest density (medium density) will help alleviate the status of Pinus massoniana being restricted by P. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Remote Sensing is the property of Editorial Office of Journal of Remote Sensing & Science Publishing Co. 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 Forest Research is the property of Forest Research Editorial Office 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 Forest Research is the property of Forest Research Editorial Office 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 Forest Research is the property of Forest Research Editorial Office 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.)