The effects of increased snow depth on plant and microbial biomass and community composition along a precipitation gradient in temperate steppes
The effects of increased snow depth on plant and microbial biomass and community composition along a precipitation gradient in temperate steppes
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温带草原降雪深度增加对植物和微生物生物量以及沿降水梯度的群落组成的影响
DOI：
10.1016/j.soilbio.2018.06.004
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发表时间：
2018-09
影响因子：
9.7
通讯作者：
Liu Lingli
中科院分区：
文献类型：
--
作者：
Liu Weixing;Allison Steven D.;Li Ping;Wang Jing;Chen Dima;Wang Zhenhua;Yang Sen;Diao Liwei;Wang Bin;Liu Lingli
降水的变化可能会极大地改变植物和微生物的活动，从而改变草地生态系统的动态。我们调查了不同草原连续10年的雪处理后，雪深的变化如何影响植物，微生物及其关系。在内蒙古地区，沿225 ~ 375 mm的年平均降水量梯度沿着选择了8个防雪栅栏。对于每个雪围栏，研究地块设置在7个样带不同水平的积雪深度。我们发现，生态系统的属性，包括土壤水分，生物量和氮（N）库的微生物和植物，真菌：细菌的比例和草：杂类草的比例，增加与积雪深度较低的MAP干燥的网站，但不是在潮湿的网站与较高的MAP。在任何给定的网站，这些生态系统特性的敏感性，在雪深的变化是由这些变量对雪深的斜率。结果表明，这些生态系统特性的雪深变化的敏感性与MAP水平的增加线性下降。此外，我们还发现，增加积雪深度的微生物和植物生物量之间的关系从积极转变为消极的。我们的工作揭示了雪水在调节温带草原植物和微生物过程中的重要性，特别是在MAP较低的条件下。更大的植物和微生物的生物量和社会转向更大的真菌：细菌和草：杂类草的比例意味着增加融雪输入缓解温带草原和改变植物和微生物群落的水分限制。我们的研究有助于更好地预测冬季降水的变化如何影响草原植物和土壤微生物的生物量和组成。
Shift in precipitation regime could greatly alter plant and microbial activity, and thus the contemporary and future ecosystem dynamics in grasslands. We investigated how changes in snow depth affect plants, microbes and their relationships after 10 consecutive years of snow treatments in different steppes. We selected 8 snow fences along a mean annual precipitation (MAP) gradient from 225 to 375 mm in Inner Mongolia. For each snow fence, study plots were set up at 7 transects with different levels of snow depth. We found that ecosystem properties, including soil moisture, the biomass and nitrogen (N) pools of microbes and plants, the fungi: bacteria ratio and the grass: forb ratio, increased with increasing snow depth at the drier sites with lower MAP, but not at the wetter sites with higher MAP. At any given site, the sensitivity of these ecosystem properties to changes in snow depth was determined by the slopes of these variables against snow depth. The results showed that the sensitivity of these ecosystem properties to changes in snow depth decreased linearly with increase in MAP levels. In addition, we also found that increased snow depth shifted the relationship between microbial and plant biomass from positive to negative. Our work reveals the importance of snow water in regulating plant and microbial processes in temperate steppes, especially under lower MAP conditions. The greater plant and microbial biomass and the shift of community toward greater fungi: bacteria and grass: forb ratio imply that increased snowmelt input alleviated water limitation in temperate steppes and altered plant and microbial communities. Our study helps to better predict that how changes in winter precipitation could affect the biomass and composition of plants and soil microbes in grasslands.
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中国冬季积雪深度变化及其对植被的影响
影响因子：
11.6
作者：
Peng, Shushi;Piao, Shilong;Ciais, Philippe;Fang, Jingyun;Wang, Xuhui
通讯作者：
Wang, Xuhui
影响因子：
6.7
作者：
A. Leffler;J. Welker
通讯作者：
A. Leffler;J. Welker
影响因子：
1.7
作者：
M. Loik;A. Griffith;H. Alpert
通讯作者：
M. Loik;A. Griffith;H. Alpert
DOI：
10.1097/01.asw.0000547844.39931.b6
发表时间：
2018-12
期刊：
The Journal of the Oklahoma State Medical Association
影响因子：
--
作者：
H. Schmid
通讯作者：
H. Schmid
影响因子：
9.7
作者：
T. Semenova;Luis N. Morgado;J. Welker;M. Walker;E. Smets;J. Geml
通讯作者：
T. Semenova;Luis N. Morgado;J. Welker;M. Walker;E. Smets;J. Geml