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宁夏中部干旱带草地20年生产力和承载力变化研究
引用本文:兰剑,沈艳.宁夏中部干旱带草地20年生产力和承载力变化研究[J].农业科学与技术,2011(4):600-602,607.
作者姓名:兰剑  沈艳
作者单位:宁夏大学草业科学研究所;宁夏大学西北退化生态系统恢复与重建教育部重点实验室
基金项目:Supported by Key Scientific and Technological Projects in Ningxia Hui Autonomous Region"Research and Demonstration of Sustain-able Utilization Technology in Arid and Semiarid Grassland in Ningxia Hui Autonomous Region"~~
摘    要:目的]探讨宁夏中部干旱带草地植被逆行演替规律。方法]以1982~2001年的调查资料为基础,对7个调查样点的草地型、植被特征、草地生产力及草地质量进行分析。结果]宁夏中部干旱带的草地型在近20年的时间里已经发生或正在发生变化,群落内优势种也正在被其他种所代替,植被覆盖度和群落内植物种数在持续下降,草地承载力平均下降了114%,草地质量严重下降。结论]该研究为典型草原可持续利用提供了基础数据。

关 键 词:草地  退化  植被演替  生产力  承载力

Changes of Productivity and Bearing Capacity of Grassland in Arid Zone of Central Ningxia over 20 Years
LAN Jian,SHEN Yan.Changes of Productivity and Bearing Capacity of Grassland in Arid Zone of Central Ningxia over 20 Years[J].Agricultural Science & Technology,2011(4):600-602,607.
Authors:LAN Jian  SHEN Yan
Institution:1,2 1.Grassland Institute,Ningxia University,Yinchuan 750021;2.Key Laboratory of Degraded Ecosystem Restoration and Rehabilitation in Northwest China of Ministry of Education,Ningxia University,Yinchuan 750021
Abstract:Objective] The paper was to explore the vegetation regressive succession law in arid zone of central Ningxia.Method] Based on the survey data during 1982-2001,the grass type vegetation characteristics,grassland productivity and the quality of grass in 7 survey sites were analyzed.Result] The grass type in arid zone of central Ningxia had changed or was changing in the last 20 years;the dominant species within communities were also replacing by other species,vegetation coverage and number of plant species within communities were continuously declined,the bearing capacity of grassland had averagely declined by 114%,and the quality of grassland seriously declined.Conclusion] The study provided basic data for the sustainable use of typical grassland.
Keywords:Grassland  Degradation  Vegetation succession  Bearing capacity
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