Grazing modulates soil temperature and moisture in a Eurasian steppe
Grazing modulates soil temperature and moisture in a Eurasian steppe
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放牧调节欧亚草原的土壤温度和湿度
DOI：
10.1016/j.agrformet.2018.07.011
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发表时间：
2018-11
影响因子：
6.2
通讯作者：
Lijun Xu
中科院分区：
文献类型：
--
作者：
Yuchun Yan;Ruirui Yan;Jiquan Chen;Xiaoping Xin;David J. Eldridge;Changliang Shaoa;Xu Wang;Shijie Lv;Dongyan Jin;Jinqiang Chen;Zhenjie Guo;Baorui Chena;Lijun Xu
很少有研究涉及放牧对小气候的潜在影响，如地表温度和湿度，以及它们对草地功能的反馈作用。在不同放牧强度的试验区进行了连续约三年的研究，并对土壤温度和水分进行了现场测量。结果表明，放牧显著改变了土壤温度和水分。土壤温度呈指数上升，随着放牧强度增加，在温暖的季节，由于地上生物量（AGB）的去除和线性下降，随着放牧强度增加，在寒冷的季节，由于AGB和风吹雪积累减少。4月至10月，重度放牧使土壤温度（10厘米深）平均升高2.6 ° C（最大时温升高8.8 ° C），土壤变暖效应是全球变暖效应的3.7倍。结果表明，与未放牧样地相比，放牧样地由于冬季积雪量较少，土壤贮水量减少，尤其是在生长季初期，由于冬季积雪量较未放牧样地少。在草地生态系统中，未放牧样地0-100 cm土层平均贮水量为23.3%，是放牧样地的1.3-1.8倍。结果表明，放牧对草地土壤也产生了增温和干燥效应。放牧引起的土壤暖干化对生态系统的长期反馈效应可能是加速草原退化和荒漠化的重要机制。
Few studies have addressed the potential grazing effects on microclimate, such as surface temperature and moisture, and their feedback effects on grassland function. A continuous, approximately three-year long study was conducted in experimental plots of various grazing intensities, andin situsoil temperature and moisture were measured. The results indicated that grazing significantly altered soil temperature and moisture. Soil temperature increased exponentially with increasing grazing intensity in the warm season due to the removal of aboveground biomass (AGB) and decreased linearly with increasing grazing intensity in the cold season due to decreases in both AGB and wind-blown snow accumulation. Heavy grazing increased soil temperature (10 cm depth) by an average of 2.6 °C from April to October (the largest hourly temperature increase was 8.8 °C), representing a soil warming effect 3.7 times that of global warming. Our findings showed that, compared with ungrazed plots, grazed plots had decreased soil water storage due to less winter snow accumulation, especially in the early growing season (EGS) because of the smaller amount of winter snow accumulation than in ungrazed plots. In the EGS, the average water storage in the 0–100 cm layer of the ungrazed plots was 23.3%, which was 1.3–1.8 times that of the grazed plots. Our results showed that grazing also produced warming and drying effects on grassland soil. The long-term feedback effects of grazing-induced soil warming and drying on the ecosystem might be an important mechanism accelerating the degradation and desertification of these grasslands.
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生长季节对青藏高原反照率动态的贡献更大
影响因子：
3.7
作者：
Tian L;Chen J;Zhang Y
通讯作者：
Zhang Y
影响因子：
2
作者：
Aalto, Juha;le Roux, Peter C.;Luoto, Miska
通讯作者：
Luoto, Miska
DOI：
10.1016/j.rama.2014.12.001
发表时间：
2014-09
期刊：
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影响因子：
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作者：
R. Yan;X. Xin;Yuchun Yan;Xu Wang;B. Zhang;Guixia Yang;Shimin Liu;Yu Deng;Linghao Li
通讯作者：
R. Yan;X. Xin;Yuchun Yan;Xu Wang;B. Zhang;Guixia Yang;Shimin Liu;Yu Deng;Linghao Li
影响因子：
6.1
作者：
I. Odriozola;G. García-Baquero;N. A. Laskurain;A. Aldezabal
通讯作者：
I. Odriozola;G. García-Baquero;N. A. Laskurain;A. Aldezabal
DOI：
--
发表时间：
2007-12
期刊：
--
影响因子：
--
作者：
S. Solomon
通讯作者：
S. Solomon