天山西段北麓主要草地类型的地上生物量时空分布格局

The spatial and temporal distributions of aboveground biomass of main grassland types in the northern foot of the western Tianshan Mountains

以天山西段北麓草地生态系统为研究对象,通过2012—2021年实际调查并结合遥感影像数据对不同类型草地的地上生物量时空变化进行分析。结果表明:温性草原、温性荒漠草原、温性草原化荒漠和温性荒漠草地地上年均生物量分别为114.65±18.04、58.67±8.49、46.56±7.34、57.74±8.57 g·m^(-2)。空间上,随纬度自北向南方向生物量呈现高-低-高的分布模式,随着经度的增加,生物量由西向东方向呈显著降低的趋势(P<0.05);草地地上生物量在空间上随着海拔升高而增加,时间上随时间推移整体呈下降趋势,其中山地草甸类下降最为显著(P<0.05)。分析该区域草地生物量时空变化可为天山西段北麓草场资源的可持续利用和畜牧业的发展提供指导。

We analyzed the temporal and spatial variations of aboveground biomass across different grassland types in the northern foot of the western Tianshan Mountains by field survey in combination with remote sensing image da-ta from 2012 to 2021.The results showed that annual average aboveground biomass of warm steppe,warm desert steppe,warm steppe desert,and warm desert grasslands were 114.65±18.04,58.67±8.49,46.56±7.34 and 57.74±8.57 g·m^(-2)respectively.Spatially,there was a high-low-high distribution pattern of biomass from north to south with latitude,and a significantly decreased trend from west to east with the increase of longitude(P<0.05).Aboveground biomass of grassland increased spatially with the increases of altitude,while decreased over time,especially in mountain meadow(P<0.05).Our results provide guidance for the sustainable utilization of grassland resources and the development of animal husbandry in the north foot of the western Tianshan Mountains.