高寒沙地2种锦鸡儿的根系分布  

Root Distribution of Two Species of Caraganain Alpine Sandy Land

作　　者：朱雅娟[1] 贾志清[1] 薛海霞[2] 

机构地区：[1]中国林业科学研究院荒漠化研究所青海共和荒漠生态系统定位观测研究站,北京100091 [2]中国林业科学研究院林业研究所,北京100091

出　　处：《西北林学院学报》2016年第2期120-125,共6页Journal of Northwest Forestry University

基　　金：国家自然科学基金项目"青藏高原荒漠化土地人工植被水分利用过程研究"(41301095)

摘　　要：中间锦鸡儿和柠条锦鸡儿是共和盆地沙丘造林的主要树种。通过剖面法比较了2种锦鸡儿10年生人工林的不同级别的根系分布特征。结果表明:2种锦鸡儿均为深根系植物,深度达到1m。中间锦鸡儿的根系生物量主要分布在0~60cm。其中,粗根、中根和细根分别主要分布在0~30、0~60cm和0~60cm。然而,它的3个不同径级根系的长度分别主要分布在0~30、0~50cm和0~60cm。柠条锦鸡儿的根系生物量主要分布在0~90cm。其中,粗根、中根和细根分别主要分布在0~60、0~60cm和0~90cm。然而,它的3个不同径级根系的长度分别主要分布在0~60、0~60cm和0~70cm。因此,中间锦鸡儿的根系相对较浅,适宜吸收降雨补充的浅层和中层土壤水分。柠条锦鸡儿的根系向更深的土壤中生长,吸收深层土壤水分。这反映了2种锦鸡儿对高寒沙地半干旱气候的适应差异。Caragana intermedia and C.korshinskii are tow main shrubs used in the re-vegetation on sand dunes in Gonghe Basin.Root distribution characteristics of different types of two Caragana species were studied by profile method.The results showed that 10-years-old plantation of two species were deep-rooted,which was as deep as 1m.The fresh and dry mass of C.intermediadistributed mainly in 0-60 cm,and the coarse roots,medium roots and fine roots distributed in 0-30,0-40 and 0-60 cm depths,respectively.However,the length of different root types distributed in 0-30,0-50 and 0-60 cm,respectively.The fresh and dry mass of C.korshinskii distributes mainly in 0-90 cm depth,and the coarse roots,medium roots and fine roots distributed in 0-60,0-60.and 0-90 cm,respectively.However,the length of different types of C.korshinskii roots distributed in 0-60,0-60 and 0-70 cm.Therefore,the relative shallower root system of C.inermedia was suitable to use soil water in shallow and medium depth;the root system of C.konshinskii grew to deeper depth to use deeper soil water,indicating the differences in the adaptation characteristics of two Caraganashrubs to semi-arid climate in alpine sandy land.

关 键 词：中间锦鸡儿 柠条锦鸡儿 根系 生物量 根长 

分 类 号：S793.3[农业科学—林木遗传育种]