毛乌素沙地臭柏、油蒿群落细根生产与生长过程中养分的动态  

The Nutrients Dynamics in Fine Root of Sabina vulgaris and Artemisia ordosica during Root Growth in Mu Us Sandland

作　　者：秦艳[1] 胡永宁 王林和[3] 张国盛[3] 王宁[1] 王海[1] 

机构地区：[1]中国农业科学院草原研究所∕农业部鄂尔多斯沙地草原生态环境重点野外科学观测试验站,内蒙古呼和浩特010010 [2]内蒙古林业勘查设计院,内蒙古呼和浩特010020 [3]内蒙古农业大学生态环境学院,内蒙古呼和浩特010019

出　　处：《中国草地学报》2013年第5期96-102,共7页Chinese Journal of Grassland

基　　金：国家自然科学基金项目“细根生产与周转”(30471423);中央级公益性科研院所基本科研业务费专项资金(中国农业科学院草原研究所1610332013001)

摘　　要：采用钻土芯法对毛乌素沙地分布的天然臭柏、油蒿细根生产进行连续两年的动态研究,以揭示细根在沙地生态系统物质循环中的作用。结果表明:臭柏细根占其总根量的60.10%,年平均生物量为14.480t/hm2,52.72%为活细根。油蒿细根占总根系的73.04%,年平均生物量为1.027t/hm2,活细根占53.57%。臭柏细根生物量显著高于油蒿(P<0.05),为油蒿的14.11倍。臭柏、油蒿的细根生物量季节动态都呈现双峰型,油蒿细根生物量峰值出现在春末夏初和晚秋;臭柏细根生物量的峰值出现在春末和盛夏。臭柏、油蒿细根C、N、P、K、Ca、Mg的浓度处于不断变化中,臭柏细根中C、N、P、K、Ca、Mg的现存量在2005年基本呈倒"S"型,在2006年基本呈"V"字型;油蒿细根中C、N、P、K、Ca、Mg的现存量总体上看呈倒"S"型。In order to understand the effect of fine roots in the material cycle of sandland ecosystem, the fine root production of natural Sabina vulgaris and Artemisia ordosica that distribute in Research Cen- ter of Development and Management in Mu Us Sandland was dynamically surveyed by sequential root co- ring from 2005 to 2006. The results showed that： 1. The total fine root biomass of Sabina vulgaris ac- counted for 60. 10% of its total root biomass, annual average of fine root biomass（≤2mm in diameter） were 14. 480 t/hm2 , living fine root biomass was 52.72% of the fine root biomass, the total fine root bio- mass of Arternisia ordosica was 73.04% of its total root biomass, annual average of fine root hiomass （≤2mm in diameter） were 1. 027t/hm2 , living fine root biomass accounted for 53.57% of all fine root. Fine root biomass of Sabina vulgaris was 14.11 times as high as that of Arteraisia ordosica （P〈0.05）. The curves of fine root biomass of Sabina vulgaris and Artemisia ordosica showed two peaks. 2. Nutrient content of C, N, P, K, Ca and Mg elements in fine root were constantly changeable. The content of C, N, P, K, Ca and Mg elements in fine root of S. vulgaris basically showed the reverse S--shape in 2005 and V--shape in 2006. The content of C, N, P, K, Ca and Mg elements in fine root of A. ordosica showed the reverse S--shape basically.

关 键 词：毛乌素沙地 臭柏 油蒿 细根生产 养分动态 

分 类 号：Q948[生物学—植物学]