风向及油蒿植株对生物结皮分布特征的影响  

Effect of wind direction and Artemisia ordosica on the distribution pattern of biological soil crust

作　　者：刘法[1] 张光辉[1] 杨海龙[2] 高甲荣[2] 崔强[2,3] 李柏[2,3] 

机构地区：[1]北京师范大学地理学与遥感科学学院,北京100875 [2]北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室,北京100083 [3]北京林业大学宁夏盐池荒漠化生态系统定位研究站,宁夏盐池751500

出　　处：《中国水土保持科学》2014年第4期100-105,共6页Science of Soil and Water Conservation

基　　金：国际科技合作项目"中国北方地区可持续防护林设计"(2008DFA32270)

摘　　要：为了解油蒿植株及风向对生物结皮分布的影响,采用样线法对毛乌素固定沙地油蒿植株下生物结皮的分布状况及其影响因素进行分析,结果表明：油蒿植株下的生物结皮厚度分布存在明显差异,西北方向的生物结皮最厚,西南方向与东北方向生物结皮最薄且无明显差异.生物结皮厚度的最大值出现在距离油蒿植株根部0 ～ 20 cm处,平均厚度为1.10 cm,随着与油蒿植株距离的增加,生物结皮厚度逐渐减小,在小于60 cm的范围内距离油蒿植株越近结皮厚度越厚,反之,生物结皮越薄.油蒿植株下的生物结皮分布与风向和到油蒿植株的距离有密切关系,受风向的影响,油蒿植株在西北方向可以拦蓄更多降尘,加速了在西北风向上生物结皮生长,同时油蒿植株又为生物结皮的生长过程提供有利条件.The distribution pattern of biological soil crust under Artemisia ordosica in Mu Us sandy land and its driving factors were analyzed by means of line transect sampling.The results showed that there were obvious differences in the thickness of biological soil crust around A.ordosica.The maximum of the thickness was found on the northwest of the plant.The thickness on the southwest and northeast of the plant were the thinnest and showed no significant differences.The thickest of the rust,1.l0 cm on average,were about 0-20 cm apart from the A.ordosica.The thickness of biological soil rust varied with its distance from the plant.Within 60 cm,the nearer it was from the plant,the thicker the rust was.The distributions of biological soil rust were relevant to the wind direction and the distance from A.ordosica.Affected by the wind direction,A.ordosica could help retain more dust and accelerate the development of biological soil rust on the northwest.Meanwhile,A.ordosica plants provide favorable conditions for the growth of biological soil crust.

关 键 词：油蒿 生物结皮 风向 距离 毛乌素沙地 

分 类 号：S718.8[农业科学—林学]