| 半干旱地区天然草地灌丛化与土壤异质性关系研究进展 |
| |
| 引用本文： | 张宏,史培军,郑秋红.半干旱地区天然草地灌丛化与土壤异质性关系研究进展[J].植物生态学报,2001,25(3):366-370. |
| |
| 作者姓名： | 张宏 史培军 郑秋红 |
| |
| 作者单位： | 北京师范大学环境演变与自然灾害教育部重点实验室, 北京师范大学中国沙漠研究中心, |
| |
| 基金项目： | 国家重点基础研究发展规划项目“草地与农牧交错带生态系统重建机理及优化生态-生产示范”资助(G2000018607)和国家科技部“首都圈（环北京）防沙治沙应急技术研究与示范”项目（FS2000-002） |
| |
| 摘 要： | 回顾了半干旱地区天然草地灌丛化的成因和机理、灌丛化导致草地土壤水分和养分空间异质性及其对生态系统生物地球化学过程的影响，以及土壤异质性与土地退化关系等方面的研究进展，周期性气候干旱和过度放牧是天然草地灌丛化的主要原因，伴随灌木入侵而出现的草地土壤水分和养分的空间异质性，是造成生态系统水分和养分流失，以及土壤加速侵蚀的原因之一。因此，半干旱地区天然草地的灌丛化应得到一定的控制，使群落中灌丛保持适宜的密度，以避免生态系统水分和养分的损失。
|
| 关 键 词： | 灌丛化 土壤异质性 土地退化 半干旱地区 |
| 修稿时间： | 2000年2月23日 |
RESEARCH PROGRESS IN RELATIONSHIP BETWEEN SHRUB INVASION AND SOIL HETEROGENEITY
IN A NATURAL SEMI-ARID GRASSLAND |
| |
| ZHANG Hong,SHI Pei,Jun and ZHENG Qiu,Hong.RESEARCH PROGRESS IN RELATIONSHIP BETWEEN SHRUB INVASION AND SOIL HETEROGENEITY
IN A NATURAL SEMI-ARID GRASSLAND[J].Acta Phytoecologica Sinica,2001,25(3):366-370. |
| |
| Authors: | ZHANG Hong SHI Pei Jun and ZHENG Qiu Hong |
| |
| Abstract: | The causes and mechanisms of shrub invasion in natural grassland, and the impact on soil resource (soil moisture and available nutrients) heterogeneity caused by shrub invasion of natural grassland are reviewed as are biogeochemical ecosystem processes and the relationship between soil heterogeneity and land degradation in semi-arid areas. Periodic drought and human activity are the two main factors promoting shrub invasion in semiarid areas. Temporal and spatial heterogeneity of soil resources increased with shrub invasion: as soil moisture and available nutrients accumulate under the shrub canopy forming an ‘island of fertility’. Both physical and biological factors show increasing heterogeneity with shrub establishment. Temporal and spatial heterogeneity of soil resources at the patch scale contribute to the initiation of soil erosion and consequent land degradation. Grass and shrub patch mosaic landscapes have low stability and have the highest likelihood of future land degradation. Hence, shrub invasion and shrub density in communities in natural grassland in semi-arid areas should be controlled to prevent soil erosion. Multi-scale analysis of the causes of soil resource heterogeneity in ecosystem are helpful in revealing the mechanisms of land degradation in semi-arid areas. |
| |
| Keywords: | Shrub invasion Soil moisture Soil nutrients Soil heterogeneity Land degradation |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《植物生态学报》浏览原始摘要信息 |
|
点击此处可从《植物生态学报》下载免费的PDF全文 |
