Grassland sand desertification and degradation is a great environmental problem of eco-system unbalance which should be paid more attention to in the pastoral areas of our country.
草地退化、沙化是我国牧区脆弱生态系统失衡急需整治的重大环境问题。
According to climate data(1970~2000) in the northern farming and pastoral area, the climate change cycle, trend and grassland climate productivity about 30 years were analyzed.
根据北方农牧交错带（定西县1970～2000年）的气候资料，分析了该地区30年来气候变化周期、趋势及其草地气候生产力的变化。
The yield of the annual forage and feed crops mixture grassland in agro-pastoral transitional zone of Yanmenguan region in Shanxi was studied.
研究了雁门关农牧交错带不同一年生牧草及饲料作物混播草地的产草量。
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