2024年2月29日 星期四
半干旱黄土丘陵区沙棘的光合特性及其影响因子
Photosynthetic characteristics of Hippophae rhamnoides L. and its influence factors in semiarid loess hilly region
2000年 第9卷 第1期 页码[16-21]    下载全文[0.8MB]  
摘要

结合1998年半干旱黄土丘陵区安塞的观测资料,对沙棘(Hippophae rhamnoides L.)的光合特性及影响因子进行了分析,结果表明:(1)沙棘光合速率具有明显的日变化和季节变化,月均值为11.64CO2μmol/m2·s。(2)沙棘光合速率与环境因子(气温、相对湿度、光合有效辐射及CO2浓度)间有显著的相关关系,复相关系数为0.7168~0.8745;沙棘光合速率与林地土壤水分间有极显著的相关关系,复相关系数达0.9925,且沙棘光合速率的季节动态滞后于土壤水分的月变化。(3)沙棘光合速率与植物因子(气孔导度及细胞间CO2浓度)间有十分显著的相关关系,气孔导度或细胞间CO2浓度增大,沙棘光合速率增大,反之则减小,复相关系数达0.9715和0.9708。这为分析沙棘光合作用对环境因子的响应程度,分析沙棘最适生理生态条件,提高沙棘生产力提供科学依据。

Abstract

According to the observed data at Ansai , Shaanxi Province in 1998, photosynthetic characteristics of Hippophae rhamnoides L .and its influence factors were studied in this paper .The experimental results show:(1) Photosynthetic rate has daily and seasonal variation, monthly average is 11.64 CO2μmol/m2·s .(2) Photosynthetic rate has significant correlation with the environment factors ( temperature, relative humidity, photosynthetic active radiation and CO2 concentration) , Raw R-squared is 0 .716 8 ~ 0 .874 5 .In annual growth, photosynthetic rate has significant correlation with soil moisture, and its seasonal changes fall behind that of soil moisture .( 3) Photosynthetic rate has significant correlation with plant factors ( stomatal conductance and intercellular CO2 concentration) , If stomatal conductance or intercellular CO2 concentration increases, photosynthetic rate increases, conversely it w ill decrease .These provided scientific basic data for analyzing degree of photosynthetic rate responding the environmental factors, analyzing optimum condition of physiological ecology and improving productivity .

关键词半干旱黄土丘陵区; 沙棘; 光合特性; 环境因子;
Key wordssemiarid loess hilly region; Hippophae rhamnoides L.; photosynthetic characteristics; environmental factors
作者阮成江;李代琼;
所在单位盐城工学院, 江苏盐城 224003
中国科学院水利部水土保持研究所, 陕西杨陵 712100
点击量1250
下载次数817
基金项目国家科技部中俄国际合作项目和水利部“948”引进项目资助( No .975154)