自然资源学报 ›› 2018, Vol. 33 ›› Issue (8): 1351-1362.doi: 10.31497/zrzyxb.20170726
张钦弟1,2, 卫伟1,3,*, 陈利顶1,3, 杨磊1,3
收稿日期:
2017-07-21
修回日期:
2017-11-04
出版日期:
2018-08-20
发布日期:
2018-08-20
通讯作者:
卫伟(1978- ),男,研究员,博士,研究方向为景观生态与生态水文。E-mail: 作者简介:
张钦弟(1982- ),男,河南南阳人,副教授,博士,研究方向为群落生态和生态水文。E-mail: nyzqd@126.com
基金资助:
ZHANG Qin-di1,2, WEI Wei1,3, CHEN Li-ding1,3, YANG Lei1,3
Received:
2017-07-21
Revised:
2017-11-04
Online:
2018-08-20
Published:
2018-08-20
Supported by:
摘要: 研究土壤水分、生物多样性的空间变异性是认识陆地生态系统对降水变化的响应特征及适应机制的有效途径。论文利用黄土高原自东南向西北的天然降水梯度,采用样带研究方法对47个草地0~3 m土壤水分和物种多样性进行测定,系统分析了草地土壤水分和植物物种多样性在降水梯度上(250~550 mm)的空间分异及二者之间的权衡关系。结果表明:降水自东南向西北递减是控制黄土高原草地0~3 m土壤水分和物种多样性空间异质性的关键因素。随降雨减少,土壤水分呈线性递减趋势,其中浅层土壤水分(0~1 m)与年降水量相关系数最大。物种丰富度指数和物种多样性指数随降水减少呈显著的线性递减趋势,物种均匀度指数在降水梯度上没有明显变化。370 mm年均降水量是物种多样性和土壤水分权衡关系的转折点,转折点以上二者存在协同关系,即土壤水分和物种多样性沿降水梯度以相同速率变化。370 mm年均降水量以下,物种多样性和土壤水分的权衡增大,意味着维持物种多样性以消耗土壤水分为代价。
中图分类号:
张钦弟, 卫伟, 陈利顶, 杨磊. 黄土高原草地土壤水分和物种多样性沿降水梯度的分布格局[J]. 自然资源学报, 2018, 33(8): 1351-1362.
ZHANG Qin-di, WEI Wei, CHEN Li-ding, YANG Lei. Spatial Variation of Soil Moisture and Species Diversity Patterns along a Precipitation Gradient in the Grasslands of the Loess Plateau[J]. JOURNAL OF NATURAL RESOURCES, 2018, 33(8): 1351-1362.
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