摘要
本文以定位观测资料为基础，对晋西北黄土丘陵沟壑区人工刺槐林的水分生态特点进行了研究。结果表明，在年生长期中，刺槐林地水分条件严酷、土壤有效水分少。生长期刺槐的蒸腾强度为０．１１４０ｇ·ｇ－１·ｈ－１±０．０５８６（平均值±标准差）；蒸腾强度日变化与光照强度日变化的关系最为明显：与气温日变化的关系次之；但与相对湿度日变化的关系则不明显。生长期刺槐的水势为１．７５９－Ｍｐａ±０．４５７（平均值±标准差）。水势的日变化与气温日变化的关系最为明显，与相对湿度日变化的关系次之；而与光照强度日变化的关系最不明显。刺槐的蒸腾强度季节变化与土壤水分含量季节变化的关系不够显著；水势的季节变化与土壤水分含量季节变化的关系显著；但它们的季节变化与光照强度、气温和相对湿度季节变化的关系均不够显著。刺槐的蒸腾耗水量，林分总蒸散量分别占同期降水量的１６．３％和６８．０％．
Based on the field monitoring data, this paper deals with the hydrologic ecology of R. pseudoacacia plantation in the hilly loess region,northwestern Shanxi. The results show that the soil water conductiop. of the plantation was very poor and the available water content was very low during the growing season.The transpiration intensity (TRI)of the species was 0.1140g·g-1·h-1 ±0.0586 in growing season. The daily change in TRI was very significantly correlated with light intensity, but less with air temperature. Moreover, it was not significantly correlated with relative humidity. The water potential (WP) of the species was 1.759-MPa±0.457 in growing season. The daily change in WP was significantly correlated with air temperature, but less with relative humidity. Moreover, it was not significantly correlated with light intensity. The correlation between seasonal change in TRI and soil water content was not significant, but that between seasonal change in WP and the latel proved significant. The correlation between the seasonal changes in TRI or in WP and the light intensity, the air temperature and the relative humidity was not significant. The water consumption through tree transpiration and the water consumption by the community evapotranspiration accounted for 16.3% and 68.0% of the precipitation, respectively, during the same period.
出处
《植物生态学报》
CAS
CSCD
北大核心
1996年第2期151-158,共8页
Chinese Journal of Plant Ecology
基金
国家科技攻关项目
山西省科技发展基金
关键词
刺槐
水分生态
蒸腾强度
Northwestern Shanxi
Robinia pseudoacacia
Hydrologic ecology
Transpiration intensity
Water potential
