| 孟秦倩,蔡焕杰,王健,张青峰.黄土高原坡面刺槐林土壤水分生态位特征分析[J].干旱地区农业研究,2009,27(6):89~92 |
| 黄土高原坡面刺槐林土壤水分生态位特征分析 |
| Characters of soil moisture niche-fitness of locust forest in the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2009.06.17 |
| 中文关键词: 刺槐林 土壤水分 生态位 黄土高原 |
| 英文关键词:locust forest soil moisture niche-fitness Loess Plateau |
| 基金项目:中国科学院知识创新项目(kzcx1-06-02-03)； 西北农林科技大学青年科研专项项目 |
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| 中文摘要: |
| 通过定位观测并引入土壤水分生态位适宜度,以刺槐林根系分布作为土壤水分生态位权重,对黄土高原刺槐林不同地理位置、不同坡向和不同时期土壤水分生态位进行了分析。结果表明:由南向北,土壤水分生态位递减,淳化刺槐林土壤水分生态位为97.5%,可满足刺槐生长,米脂刺槐林土壤水分生态位为53.2%,林木生长较大受水分的限制;在不同坡向间刺槐林土壤水分生态位表现为阴坡最高,阳坡最低,在生长季节,刺槐的生长受土壤水分的制约,半阴坡和半阳坡介于二者之间;在年内,春旱及春末旱,导致土壤储水量减少,7月初土壤水分生态位降到最低。随着林龄和林木密度的增加,土壤水分生态位降低,保持适当的林分密度,可实现林木的正常生长。 |
| 英文摘要: |
| The soil moisture of locust forest at different period and slope aspect from different geographic locations in the Loess Plateau is analyzed with the help of the model of the moisture niche-fitness.The results show that the value of the soil moisture niche-fitness of locust forest declines gradually from the South(Chunhua County,97.5%) to the North(Mizhi County, 53.2%) of the Loess Plateau.The growth of the locust forest is affected more by the soil moisture factor.The highest value of the moisture niche-fitness is in the north-slope,while the lowest is in the south-slope.During the growth period in a year,the drought in spring can reduce the soil moisture capacity,and it can even cause the lowest soil moisture niche-fitness at the beginning of July.Along with the increase of the age and thickness of stand,the soil moisture niche-fitness is in a downward trend.So the suitable density of stand can promote the growth of the forest. |
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