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(1) Background--As a significant ecological safeguard measure, the new round of returning farmland to forests project is of great ecological significance for ecological protection in Beijing and Tianjin. However, as a policy measure involving the withdrawal of farmers' cultivated land, whether it can guarantee the continuous in-crease of farmers' income and the stability of farmers' consumption is more worthy of discussion. (2) Methods--Based on the micro-panel data of 1115 farmers from 223 rural households in the "Beijing-Tianjin Sandstorm Source Treatment Project Monitoring" project from 2013 to 2017, this paper used the random effect model and the mediating effect model to study the impact of the new round of returning farmland to forests on the rural households' income and consumption and the effect mechanism on the rural households' consumption. (3) Results--The new round of returning farmland to forests significantly increased the total family income of the rural households, and had a significant positive impact on the total family income and operational income of the rural households at the level of 10%. However, the new round of returning farmland to forests did not improve the income structure of the rural households, and did not significantly affect the wage income, property income and transfer income of the rural households. The factors such as the farmers' education level and the number of migrant workers had a significant positive impact on the wage income. Overall, the income of the rural households was still dominated by operational income. The new round of returning farmland to forests significantly increased the total family consumption of the rural households, especially the basic consumption and productive consumption. However, there was no significant increase in children's education consumption, medical consumption and interpersonal communication consumption, which also indicated that the consumption structure of the rural households was still in basic consumption. The new round of returning farmland to forests had a positive impact on the rural households' consumption through the mediating variable of increasing the rural households' income, which verified the transmission mechanism that the farmers participated in the new round of returning farmland to forests to promote the increase of their income, and then affected their consumption. (4) Conclusions and Discussions--First, appropriately raise the subsidy standards and improve the compensation mechanism. Especially for areas prone to return to poverty and ecological functional areas, reasonable compensation standards can make up part of the losses caused by the farmers' participation in the project of returning farmland to forests. In addition, the government can implement a dynamic compensation mechanism according to the actual local situation, so that the subsidy standard is in line with the actual social and economic development situation. Second, actively promote the centralized utilization and circulation of the remaining finely fragmented land through the separation of the three rights of land. On one hand, the circulation of the fragmented land can improve the utilization rate of land, on the other hand, it can promote the flow of labor forces, so as to promote the increase of the rural households' income and the improvement of consumption structure. Third, actively implement the reform policy of forest rights, ensure clear rights to the rural households, and fully improve the promotion role of property rights income on the farmers' willingness to return farmland to forests. In addition, the farmers can also use forest rights as collateral to obtain loans to inject financial impetus into forestry production. Fourth, encourage the development of undergrowth economy and develop three-dimensional agriculture such as fruit industry, under-forest breeding industry, forage-grass planting industry, medicinal materials planting industry according to local conditions. However, while developing the corresponding undergrowth economy, we should also pay attention to the maintenance of forest nutrients, which is conducive to the sustainable and circular development of forestry. [ABSTRACT FROM AUTHOR]

(1) Background-How to solve the problem of forest farmers' choosing jobs after the implementation of the ecological compensation policies has become the key to realize the sustainable development of ecology and economy in the collective forest regions. (2) Methods-The research data came from the household survey conducted by the collective forest rights system reform monitoring project team in Shaanxi Province from July to August 2018, and 441 valid questionnaires were obtained. The OLS regression, intermediary effect model and propensity score matching method ( PSM) were used to analyze the relationship between ecological compensation policies, forest farmers' livelihood strategies and their income. (3) Results-From the perspective of direct effect, the impact of ecological compensation policies on forest farmers' income was significantly positive at the statistical level of 5%, and this effect was still significant after excluding ecological compensation samples or selecting only poverty-stricken counties as samples. From the perspective of mediating effect, the mediating effects of livelihood non-forestry and livelihood diversification on the impact of the ecological compensation policies on forest farmers' income were significant, and the mediating effect accounted for 15.58% and 19.08% respectively. From the perspective of heterogeneity of income effect, compared with those who did not participate in the policies, the total family forestry income of the forest farmers who participated in the policies decreased by 1544 yuan, but their non-forestry management income increased by 5881 yuan, non-forestry wage income increased by 4225 yuan. This indicated that after the forest farmers participated in the ecological compensation policies of public welfare forests, although they sacrificed part of the forest-land management rights to protect the ecological environment, which reduced their forestry income, they could change their livelihood strategies. The household surplus labor forces could increase their household income through non-forest employment and business activities in the secondary and tertiary industries. (4) Conclusions and Discussions-In order to improve the implementation performance of the ecological compensation policies for public welfare forests, the following policy suggestions are put forward : First, establish a dynamic adjustment mechanism for ecological compensation of public welfare forests, regularly monitor the management status of public welfare forests in poverty-stricken regions, and reward and punish them according to the monitoring results, so as to improve the initiative of the forest farmers' policy participation. Second, improve the supporting measures of the ecological compensation policies for public welfare forests and the environment for employment and entrepreneurship in forest areas. At the same time, encourage the forest farmers to rely on public welfare forests resources for employment or entrepreneurship to revitalize forestry resources. Third, strengthen the matching assistance for the forest farmers' livelihood transformation, appropriately guide the forest farmers to develop the forest undergrowth industry, or provide employment for the poor households and create more sources of livelihood for them. Fourth, encourage the transfer of forestland property rights of public welfare forests, guide the forest farmers to transfer the abandoned lands for public welfare forests to those individuals or units with higher management level, so as to promote the rational allocation of forestland resources and rural household labor resources. [ABSTRACT FROM AUTHOR]

Objective: To establish a method for simultaneous determination of 12 kinds of perfluorinated compounds (PFCs) in human urine based on ultra performance liquid chromatography tandem quadrupole linear ion trap mass spectrometry (UPLC-QTtrap-MS)., Methods: After pH adjustment with 2% formic acid, the urine samples were loaded on a WAX solid phase extraction (SPE) cartridge for extraction, purification and concentration. The eluates were collected, concentrated to dryness under nitrogen, and reconstituted with 10 mmol/L ammonium acetate aqueous solution-methanol ( V water ∶ V methanol = 70∶30) before injection. UPLC was performed on a C 18 cartridge, and methanol and 10 mmol/L ammonium acetate aqueous solution was used as mobile phases with gradient elution. QTtrap-MS was operated in multiple reaction monitoring (MRM) mode, and the internal standard calibration curves were applied for quantitative analysis., Results: Good linearity was obtained in the linear range, with the method detection limits and method quantification limits being 0.032 ng/L-6.5 ng/L and 0.10 ng/L-21 ng/L, respectively, for the 12 kinds of PFCs. The spiked recoveries of the 12 kinds of PFCs were 91.5%-114%, with the intra-day precision and the inter-day precision being 0.57%-16.0% and 1.88%-20.1%, respectively. The established method was applied to the determination of 12 kinds of PFCs in the urine samples of primary school students collected in one area. Nine kinds of PFCs were detected in the urine samples in this area. Among the PFCs detected, perfluorobutanesulfonic acid (PFBS) and perfluorooctanoic acid (PFOA) were the main PFCs found in the student urine samples., Conclusion: The method established in this study could be used to simultaneously examine 12 kinds of PFCs in urine. The method combined SPE with isotope internal standard correction and achieved good sensitivity and accuracy., (Copyright© by Editorial Board of Journal of Sichuan University (Medical Sciences).)