Grazing primarily drives the relative abundance change of C4 plants in the typical steppe grasslands across households at a regional scale
Grazing primarily drives the relative abundance change of C4 plants in the typical steppe grasslands across households at a regional scale
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放牧主要驱动区域尺度典型草原草地家庭间C4植物相对丰度变化
DOI：
10.1071/rj13050
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发表时间：
2014-12
期刊：
影响因子：
--
通讯作者：
Sarula
中科院分区：
文献类型：
--
作者：
Niu Jianmng;Hou Xiangyang;Li Xiliang;Sarula
温度和放牧强度的增加促进了内蒙古草原群落C4植物的相对丰富度。然而，对于哪一个因素是家庭规模的主要驱动因素，人们缺乏了解。对内蒙古典型草原区32个农户的草地群落C4植物相对多度进行了连续5年的监测。分析了年平均温度、放牧强度及其组合对这些农户经营土地上C4植物相对多度格局的影响。结果表明：（1）典型草原的牧草质量主要由C3植物组成（87%）;（2）C4植物对环境变化更为敏感，可作为指示植物。这些C4植物包括糙隐子草（Cleistogenes squarrosa（Trin.）Keng、灰绿藜Chenopodium glaucum Linn.和猪毛菜。(3)温度和放牧强度的增加均促进了C4植物的相对多度。放牧强度是该地区C4植物相对多度变化的主要驱动力。放牧不仅改变了草地的微环境，而且C3物种被牲畜优先采食。与以往的研究结果的时间变化的丰富的C4植物的比较表明，放牧和气候因素的相对重要性取决于空间尺度的研究，气候更重要的是在区域，而不是家庭规模。
Increases in temperature and grazing intensity are believed to promote the relative abundance of C4 plants in grassland communities in Inner Mongolia. However, there is a lack of understanding as to which factor is the primary driver at the household scale. The relative abundance of C4 plants in grassland communities within 32 households was monitored over a 5-year period (2008–12) in the typical steppe region of Inner Mongolia. The relationships between the mean annual temperature, grazing intensity and their combinations on the patterns of the relative abundance of C4 plants across the land managed by these households were analysed. The results showed that (1) the herbage mass of the typical steppe grassland was mainly composed of C3 plants (87%); (2) the C4 plants were more sensitive to, and can be used as indicators of, environmental changes. These C4 species included Cleistogenes squarrosa (Trin.) Keng, Chenopodium glaucum Linn. and Salsola collina Pall.; (3) both increasing temperature and grazing intensity promoted the relative abundance of C4 plants. Grazing intensity was the primary driver of the change in relative abundance of C4 plants in this region. Not only did grazing change the micro-environment of the grasslands, but also the C3 species were preferentially grazed by the livestock. Comparison of the results with previous studies on the temporal variation in the abundance of C4 plants suggests that the relative importance of grazing and climatic factors depends on the spatial scales of the studies, with climate being of greater importance at the regional rather than the household scale.
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影响因子：
3.5
作者：
J. Reeder;G. Schuman;J. Morgan;D. Lecain
通讯作者：
J. Reeder;G. Schuman;J. Morgan;D. Lecain
DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
T. Braak;F. Cateten;P. Šmilauer
通讯作者：
T. Braak;F. Cateten;P. Šmilauer
影响因子：
--
作者：
D. Pushkina;H. Bocherens;Y. Chaimanee;J. Jaeger
通讯作者：
D. Pushkina;H. Bocherens;Y. Chaimanee;J. Jaeger
影响因子：
11.6
作者：
B. Ripley;J. Cunniff;C. Osborne
通讯作者：
B. Ripley;J. Cunniff;C. Osborne
内蒙古草原C3/C4物种丰度变化：来自土壤和植被同位素组成的证据
影响因子：
11.6
作者：
Bai, Yongfei;Schnyder, Hans;Schaeufele, Rudi;Wittmer, Maximilian H. O. M.;Auerswald, Karl
通讯作者：
Auerswald, Karl