Effects of grazing on a Leymus chinensis grassland on the Songnen plain of north-eastern China
Effects of grazing on a Leymus chinensis grassland on the Songnen plain of north-eastern China
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DOI：
10.1006/jare.1996.0214
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发表时间：
1997-06
影响因子：
2.7
通讯作者：
W. Renzhong;E. Ripley
中科院分区：
文献类型：
--
作者：
W. Renzhong;E. Ripley
摘要1989年在松嫩平原羊草草地进行了放牧对土壤和植物性状影响的定量研究。五个放牧强度进行了检查，每个使用15个样地。土壤容重和pH值随放牧强度的增加而增加，土壤含水量和有机质则随放牧强度的增加而降低。当林冠覆盖更多可口的植物，如L。中国和豆类，减少，那些不太可口的植物，如碱蓬和Aeluropus littoralis的增加显着。植物区系组成的变化主要反映在多年生中生植物（如L。中国，小叶章和豆类），并增加了一年生草（特别是虎尾草）和盐生植物（如S。corniculata和Puccinellia tenuiflora），盐生植物在重度放牧下占优势。物种多样性最大的中间放牧强度和最轻的放牧样地。植物群落生物量随放牧强度的增加而显著下降，地上部和地下部分别下降了47%和53%。过度放牧似乎是这片草地退化的主要原因。
Abstract A field study was carried out in 1989 to quantify the effects of grazing on soil and plant properties in a Leymus chinensis grassland on the Songnen plain of north-eastern China. Five intensities of grazing were examined using 15 sample plots in each. Soil bulk density and pH increased with grazing intensity, while soil moisture and organic matter decreased. As the canopy covers of more palatable plants, such as L. chinensis and legumes, diminished, those of less palatable plants, such as Suaeda corniculata and Aeluropus littoralis , increased significantly. Changes in floristic composition were reflected primarily in decreases in the numbers of perennial mesophytes (such as L. chinensis, Calamagrostis epigeios and legumes), and increases in annual grasses (especially Chloris virgata ) and halophytes (such as S. corniculata and Puccinellia tenuiflora ), with halophytes becoming dominant under heavy grazing. Species diversity was greatest at the intermediate grazing intensities and least in the lightly grazed plots. Plant community biomass decreased significantly as grazing intensity increased—by as much as 47% (above-ground) and 53% (below-ground). Overgrazing appears to be the principal reason for deterioration of this grassland.