摘要
利用生态位适宜度理论建立了沙坡头人工植被防护林体系无灌溉条件下 ,两种固沙植物油蒿 (Artemisiaordosica Krasch.)和柠条 (Caragana korshinskii Kom .)的水分生态位适宜度模型。并据此分析比较在 5种不同配置格局下 ,在不同的降水量年份 ,这两种植物的水分利用状况。主要结论如下 :不论在生长季总降水量为 80 .6 3 mm的 1991年还是在降水量大一倍的 1993年 ,单播下油蒿的水分生态位适宜度均大于混播下的适宜度 ,且在 7月份均有一个水分极其匮乏期 ;单播下柠条的水分生态位适宜度均小于混播下的适宜度 ;单播的 3种格局中 ,以 2 m× 2 m的株距和行距 (即样地 1,3)为最佳 ,混播的两种格局以 1m× 1m的株距和行距 ,且按 2行油蒿× 2行柠条 ,中间空一行的方式配置 (即样地 5 )为最佳。最后 。
Niche and fitness concepts are applied in this study of the dynamics of water availability and growth characteristics under five separate restoration planting regimes on stable sand dunes in the Shapotou area. Field soil water data was used to parameterize a mathematical model that calculates the relative water fitness of two species—? 獳rtemisia ordosica Krasch. and Caragana korshinskii Kom——along a gradient of water availability. This model indicates that A.ordosica had the lowest water deficit in July and that its water fitness was higher in mono-species plantings than in mixture. The water fitness of C.korshinskii was lower in mono-specific stands than when mixed. These trends occurred despite two-fold variation in growth season precipitation. Of three single-species planting patterns the 2×2 gave the best results in terms of plant growth. Of the two mixed planting patterns, 2 lines of A . ordosica ×2 lines of C. korshinskii with one line blank after every four lines was best.
出处
《植物生态学报》
CAS
CSCD
北大核心
2001年第1期6-10,共5页
Chinese Journal of Plant Ecology
基金
国家自然科学基金青年项目! (3990 0 0 2 1)
关键词
油蒿
柠条
水分生态位适宜度
配置格局
沙坡沙
防护林
Artemisia ordosica Krasch., Caragana korshinskii Kom., Water niche fitness, Planting pattern, Shapotou area
