摘要
根据1985～1989年的试验,对松嫩平原南部天然羊草(Aneurolepidium chinense)草地的水分生态环境进行了分析。研究表明:松嫩平原南部羊草草地年水分收支基本相等,但收与支的时间格局不一致,6月明显干旱,7月末地表暂时性积水;土壤含水率在生长季初期(4月)最高,雨季来临前(6月)最低;空气相对湿度在整个生长季中均较低,生长季初期尤为明显;人类对草地的过度利用已对水分生态环境造成严重的不良影响。生长季前期干旱抑制植物同化器官的充分生长和发育,使其不能有效利用雨季的大量降水;空气干旱降低植物的 CO_2同化量,二者都制约草地生产力的提高。本文还从治标和治本两个角度探讨了改善松嫩羊草草地的水分生态环境,提高生产力的途径。
The main characters of the hydro-ecological environment of the aneurolepidium chinense grassland in Northeast China are:The annual precipitation input and the consumption ouput of the grassland are equal in amount roughly,but the time patterns of the input and output are different,it causes the spring to be very dry,while the summer has water stored on the ground;the water content of soil is highest at the beginning of the growing season,and lowest in the time when the rainfull period will come;there's air drought clearly within the whole growing season;the overusing of the grassland by human being have serious harmful effect on the hydro-eclogical environment of the grassland.The water deficit happened in the early time of the growing season will restrict the plant to use the large amount of water in the rainfull period,the air drought affects the photosynthesis of plant,both the two restrict the increasing of productivity of the grassland.So.water is the important limiting factor of raising the productivity of A.chinense grassland in Northeast China.The approaches of improving hydro-ecological environment and increasing the productivity of A.chinese grassland in Northeast China were also proposed in this paper.
出处
《草业科学》
CAS
CSCD
北大核心
1993年第1期14-20,共7页
Pratacultural Science
关键词
羊草
草地
水分
生态学
环境
分析
Aneurolepidium chinense grassland in south Song-Nen plain
Hydro-ecological environment,productivity
