黄土丘陵区微地形对草地植物群落结构组成和功能特征的影响

应用生态学报

黄土丘陵区微地形对草地植物群落结构组成和功能特征的影响

汝海丽^1,2,张海东³,焦峰^1,3*,薛超玉³,郭美丽^1,2

(¹中国科学院水利部水土保持研究所, 陕西杨凌 712100; ²中国科学院大学, 北京 100049; ³西北农林科技大学资源环境学院, 陕西杨凌 712100)

出版日期:2016-01-18 发布日期:2016-01-18

Impact of micro-landform on grassland plant community structure and function in the hilly Loess Plateau region, China.

RU Hai-li^1,2, ZHANG Hai-dong³, JIAO Feng^1,3*, XUE Chao-yu³, GUO Mei-li^1,2

(¹Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100, Shaanxi, China; ²University of Chinese Academy of Sciences, Beijing 100049, China; ³College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China)

Online:2016-01-18 Published:2016-01-18

摘要/Abstract

摘要：

对黄土丘陵区微地形(阳坡坡上、中、下部，坡顶，阴坡坡上、中、下部)条件下草地植物群落进行群落组成调查和地上、地下生物量测定，分析微地形对草地植物群落结构组成和功能特征的影响.结果表明：研究区内草地植物群落主要由菊科、禾本科和豆科物种组成.群落地上和地下生物量以及根系年生长量分别为164.12 g·m^-2、1044.87 g·m^-2、731.77 g·m^-2·a^-1.群落地上和地下生物量以及根系年生长量在不同坡向的大小均为：阴坡>阳坡>坡顶.在阴坡，群落生物量和根系年生长量的大小为：坡下部>坡中部>坡上部>坡顶部，阳坡群落生物量在不同坡位的大小顺序与阴坡不同.根系生长主要集中在0～20 cm土层，且从上到下逐渐减小.根系周转率的平均值为0.75 a^-1，在不同微地形条件下不同土层内大小不同.

Abstract: In order to analyze the impact of micro-landform on grassland plant community structure and function, species composition, aboveground and belowground biomass, and annual fine root production at different slope aspects (sunny slope and shady slope) and different slope positions (top, upper, middle and lower) were investigated in the hilly Loess Plateau region. The results showed that grassland communities were mainly composed of plants species belonging to Compositae, Poaceae and Leguminosae. The aboveground and belowground biomass and annual fine root production of community were 164.12 g·m^-2, 1044.87 g·m^-2 and 731.77 g·m^-2·a^-1, respectively. Aboveground biomass, belowground biomass and annual fine root production of community were in the order of shady slope > sunny slope > top slope.
In shady slope, the biomass of community under different positions were in the order of lower > middle > upper > top, but it exhibited different orders in the sunny slope compared with shady slope. Fine root mainly concentrated in the 0-20 cm top soil layer and decreased with soil depth. The average turnover time of root was 0.75 a^-1 and changed with soil layers and micro-landform.

汝海丽1,2,张海东3,焦峰1,3*,薛超玉3,郭美丽1,2. 黄土丘陵区微地形对草地植物群落结构组成和功能特征的影响[J]. 应用生态学报.

RU Hai-li1,2, ZHANG Hai-dong3, JIAO Feng1,3*, XUE Chao-yu3, GUO Mei-li1,2. Impact of micro-landform on grassland plant community structure and function in the hilly Loess Plateau region, China.[J]. Chinese Journal of Applied Ecology.