期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
松嫩平原黑土农业生态系统演替规律分析 被引量:9
1
作者 孟凯 张红艳 《农业系统科学与综合研究》 CSCD 北大核心 2001年第4期264-264,269,共2页
黑土农业生态系统 2 0 0年的演替历史 ,几乎跨越了我国中原地区 30 0 0年的演替过程。从黑土农业生态系统演替的主导因素分析入手 ,系统地分析了结构、环境、生产力和管理技术的演替 ,揭示了黑土农业生态系统的演替规律。表 5 ,参
关键词 黑土 演替规律 农业生态系统 管理技术演替 结构演替 松嫩平原 生产力演替 环境演替
下载PDF
Changes of Productivity and Bearing Capacity of Grassland in Arid Zone of Central Ningxia over 20 Years 被引量:1
2
作者 兰剑 沈艳 《Agricultural Science & Technology》 CAS 2011年第4期600-602,607,共4页
[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 prod... [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. 展开更多
关键词 GRASSLAND DEGRADATION Vegetation succession Bearing capacity
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部