In this study,the interplay between ecosystem services and human well-being in Seni district,which is a pastoral region of Nagqu city on the Qinghai-Tibet Plateau,is investigated.Employing the improved InVEST model,CA...In this study,the interplay between ecosystem services and human well-being in Seni district,which is a pastoral region of Nagqu city on the Qinghai-Tibet Plateau,is investigated.Employing the improved InVEST model,CASA model,coupling coordination model,and hierarchical clustering method,we analyze the spatiotemporal patterns of ecosystem services,the levels of resident well-being levels,and the interrelationships between these factors over the period from 2000 to 2018.Our findings reveal significant changes in six ecosystem services,with water production decreasing by 7.1%and carbon sequestration and soil conservation services increasing by approximately 6.3%and 14.6%,respectively.Both the habitat quality and landscape recreation services remained stable.Spatially,the towns in the eastern and southern areas exhibited higher water production and soil conservation services,while those in the central area exhibited greater carbon sequestration services.The coupling and coordination relationship between ecosystem services and human well-being improved significantly over the study period,evolving from low-level coupling to coordinated coupling.Hierarchical clustering was used to classify the 12 town-level units into five categories.Low subjective well-being townships had lower livestock breeding services,while high subjective well-being townships had higher supply,regulation,and support ecosystem services.Good transportation conditions were associated with higher subjective well-being in townships with low supply services.We recommend addressing the identified transportation disparities and enhancing key regulatory and livestock breeding services to promote regional sustainability and improve the quality of life for Seni district residents,thus catering to the diverse needs of both herdsmen and citizens.展开更多
The mechanisms underlying the response of soil respiration(Rs) to nitrogen(N) addition remain to be explored in semiarid ecosystems. This study was conducted to determine the effect of N addition on soil microbial com...The mechanisms underlying the response of soil respiration(Rs) to nitrogen(N) addition remain to be explored in semiarid ecosystems. This study was conducted to determine the effect of N addition on soil microbial composition, Rs and the temperature sensitivity of Rs(Q10). The N addition experiment was carried out in a semiarid grassland in China, with N fertilizer application rates of 0, 2, 4, 8, 16, or 32 gN m-2yr-1. Microbial phospholipid fatty acids(PLFAs), Rs and Q10 were measured, and their relationships with soil properties were determined for three growing seasons. The results showed that N addition significantly increased the content of soil dissolved organic carbon(DOC) and inorganic nitrogen(IN), and decreased soil p H. With respect to soil microbes, N addition reduced soil PLFAs, reduced the fungi to bacteria ratio(F:B) and increased the gram-positive bacteria to gram-negative bacteria ratio(G+:G–). Rs under the N2, N4, N8, N16 and N32 treatments decreased by 2.58%, 14.86%, 22.62%, 23.97% and 19.87%, respectively, compared to the N0(control) treatment. The results of structural equation models showed that N addition reduced Rs by lowering soil PLFAs and altering the microbial composition. However, N addition had no significant effect on either Q10, soil total organic carbon(TOC) or total nitrogen(TN), indicating that N addition alleviated soil carbon loss and was unlikely to change the potential for a bigger loss under global warming.展开更多
基金The Second Tibetan Plateau Scientific Expedition and Research Program(STEP),No.2019QZKK0608。
文摘In this study,the interplay between ecosystem services and human well-being in Seni district,which is a pastoral region of Nagqu city on the Qinghai-Tibet Plateau,is investigated.Employing the improved InVEST model,CASA model,coupling coordination model,and hierarchical clustering method,we analyze the spatiotemporal patterns of ecosystem services,the levels of resident well-being levels,and the interrelationships between these factors over the period from 2000 to 2018.Our findings reveal significant changes in six ecosystem services,with water production decreasing by 7.1%and carbon sequestration and soil conservation services increasing by approximately 6.3%and 14.6%,respectively.Both the habitat quality and landscape recreation services remained stable.Spatially,the towns in the eastern and southern areas exhibited higher water production and soil conservation services,while those in the central area exhibited greater carbon sequestration services.The coupling and coordination relationship between ecosystem services and human well-being improved significantly over the study period,evolving from low-level coupling to coordinated coupling.Hierarchical clustering was used to classify the 12 town-level units into five categories.Low subjective well-being townships had lower livestock breeding services,while high subjective well-being townships had higher supply,regulation,and support ecosystem services.Good transportation conditions were associated with higher subjective well-being in townships with low supply services.We recommend addressing the identified transportation disparities and enhancing key regulatory and livestock breeding services to promote regional sustainability and improve the quality of life for Seni district residents,thus catering to the diverse needs of both herdsmen and citizens.
基金The National Natural Science Foundation of China(31770519)The National Key Research and Development Program of China(2017YFC0503805).
文摘The mechanisms underlying the response of soil respiration(Rs) to nitrogen(N) addition remain to be explored in semiarid ecosystems. This study was conducted to determine the effect of N addition on soil microbial composition, Rs and the temperature sensitivity of Rs(Q10). The N addition experiment was carried out in a semiarid grassland in China, with N fertilizer application rates of 0, 2, 4, 8, 16, or 32 gN m-2yr-1. Microbial phospholipid fatty acids(PLFAs), Rs and Q10 were measured, and their relationships with soil properties were determined for three growing seasons. The results showed that N addition significantly increased the content of soil dissolved organic carbon(DOC) and inorganic nitrogen(IN), and decreased soil p H. With respect to soil microbes, N addition reduced soil PLFAs, reduced the fungi to bacteria ratio(F:B) and increased the gram-positive bacteria to gram-negative bacteria ratio(G+:G–). Rs under the N2, N4, N8, N16 and N32 treatments decreased by 2.58%, 14.86%, 22.62%, 23.97% and 19.87%, respectively, compared to the N0(control) treatment. The results of structural equation models showed that N addition reduced Rs by lowering soil PLFAs and altering the microbial composition. However, N addition had no significant effect on either Q10, soil total organic carbon(TOC) or total nitrogen(TN), indicating that N addition alleviated soil carbon loss and was unlikely to change the potential for a bigger loss under global warming.
