摘要
将相同的自然植被用Lysimeter从高海拔下移至低海拔 ,温度升高 2℃ ,同时设置平均降水、增加10 %降水、增加 2 0 %降水、减少 10 %降水和减少 2 0 %降水 5个降水处理 ,模拟全球变暖带来的温度升高和降水变化对植被生产力和土壤水分的影响 .两年的野外实验表明 ,温度升高造成生态适应性差的野古草(Arundineliahirta)生产力显著下降 ,致使整个测试群落生产力降低 ,低海拔实验点生产力显著低于高海拔实验点 ,温度升高对铁杆蒿 (Artemisiasacrorum)和黄背草 (Themedajaponica)的影响较小 .太行山区的植被对降水的变化反映敏感 ,降水增加使植被的生产力水平显著提高 ,其中降水增加 2 0 %的处理生产力比平均降水处理的生产力增加 2 2 % .增加降水处理的土壤含水量显著高于平均降水和降水减少的实验处理 .由于植被的减少 。
By transferring natural vegetation with soil from high elevation to low elevation,a 2℃ warmer condition was created. In each site,5 different precipitation treatments were applied to test if the temperature and precipitation changes under global warming will result in a lower soil moisture condition and,therefore,feedback negatively on vegetation productivity of the Taihang Mountain. Two years' field experiment suggested that,because of the low adaptability of Arundinelia hirta under a warmer condition,its productivity decreased significantly at the end of the experiment. Productivities of grass with better adaptability such as Themeda japonica and Artemisia sacrorum did not change significantly between the two sites. Tested vegetation demonstrated a significant increase in productivity under the higher precipitation condition by showing 22% increase in productivity under 20% higher precipitation treatment. Soil moisture condition under treatments with higher precipitation was generally higher than that under treatments with lower precipitation. In the warmer site,soil moisture became higher since the beginning of the second year.
出处
《应用生态学报》
CAS
CSCD
2002年第6期667-671,共5页
Chinese Journal of Applied Ecology
基金
国家自然科学基金资助项目 ( 4 96 710 14)
关键词
全球变暖
太行山
植被生产力
土壤水分
Global warming, Precipitation, Soil moisture, Productivity.
