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当前位置: 首页 > 文章 > 东祁连山高寒草地地上生物量的时空变化 中国水土保持科学 2019 (3) 113-120
Position: Home > Articles > Spatio-temporal variation of the aboveground biomass of the alpine grassland in eastern Qilian Mountains Science of Soil and Water Conservation 2019 (3) 113-120

东祁连山高寒草地地上生物量的时空变化

作  者：
王紫;赵锦梅;王彦辉;蒋志荣
单  位：
中国林业科学研究院森林生态环境与保护研究所;甘肃农业大学
关键词：
高寒草地;地上生物量;时空变化;东祁连山
摘  要：
高寒草地生物量受山地复杂地形影响而时空变化很大,然而研究还较少。为定量理解东祁连山地区高寒草地地上生物量的时空变化规律,为其合理保护利用和服务功能评价提供科学依据,在半干旱的甘肃天祝县抓喜秀龙乡,选择未受放牧和人为活动干扰的阴坡和阳坡的上、中、下坡位样地,以及受放牧和人为活动干扰的平地对照样地,各设4个1 m×1 m的样方,于2016年生长季各月调查1次地上生物量。结果表明:地上生物量(g/m~2)的坡向差异为阴坡生长季均值(292. 4)整体稍高于阳坡(282. 6),二者都远高于平地(163. 5);坡位差异为随坡位上升而降低,生长季均值(g/m~2)阳坡为下坡(365. 76)>中坡(268. 61)>上坡(213. 30),阴坡为下坡(323. 08)>中坡(278. 61)>上坡(275. 42);时间变化为生长季初期快速生长、之后生长逐渐变缓,符合对数函数,具体生长速率随坡向、坡位、时间而异。综合来看,受坡向和坡位导致的水热条件和土层厚度等环境因子影响,高寒草地地上生物量存在明显而复杂的时空变化。
译  名：
Spatio-temporal variation of the aboveground biomass of the alpine grassland in eastern Qilian Mountains
作  者：
WANG Zi;ZHAO Jinmei;WANG Yanhui;JIANG Zhirong;Gansu Agricultural University;Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry;
关键词：
alpine grassland;;aboveground biomass;;spatio-temporal variation;;eastern Qilian Mountains
摘  要：
[Background]The spatio-temporal variation of biomass in the alpine grassland is very large due to the complex terrain. However,such studies are rare till now. The aims of this study is to quantify the variation of aboveground biomass in alpine grassland with slope aspect,slope position,and time in growing season,to provide a scientific basis for its rational protection,utilization,and ecosystem service evaluation. [Methods] This study was carried out in the representative region of eastern Qilian Mountains and at the semi-arid Zhuaxixiulong township of Tianzhu county of Gansu province. Four plots of 1 m × 1 m were set up at the down-,middle-and up-slope on a shady slope and a sunny slope without grazing and human disturbance. In addition,as a contrast experiment,4 plots of 1 m × 1 m were set up at a level ground where grazing and human disturbance existed. Within the growing season of 2016( June-Sept.),the aboveground biomass were investigated monthly. [Results] The average aboveground biomass in growing season on the entire shady slope( 292. 4 g/m~2) was slightly higher than that on the sunny slope( 282. 6 g/m~2),and both were far higher than that on the level ground( 163. 5 g/m~2). The aboveground biomass on both sunny and shady slope decreased with rising slope position on the whole,with the growing season averages of 365. 76,268. 61 and 213. 30 g/m~2 for the down-,middle-and upslope on sunny slope,and 323. 08,278. 61 and 275. 42 g/m~2 on shady slope,respectively. The aboveground biomass first increased rapidly in the early growing season,and then increased with a declining and nonlinear rate,which was in accordance with the logarithmic function. The concrete growth rate varied with slope aspect,slope position and phenological time. [Conclusions]In general,affected by the differences in water and heat conditions and soil thickness induced by slope aspect and slope position,the aboveground biomass of alpine grassland shows an obvious and complex spatio-temporal variation.

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