JapanFlux2024 CN-In7 Inner Mongolia light grazing

We designed the field experiments to study the effects of the grazing strength on the degradation of grassland and to know the grazing capacity at the grassland in semi-arid area in Inner Mongolia.The experiments started in1991 autumn and continued to autumn in1995. An experimental grazing section (260m X 200m in rectangular area) was established on the grassland (1.6km north-east from the Naiman Station),where the micro meteorological observation had been conducted in1991,as the site of typical grassland. The experimental site was divided by barbwire fence to three 75m X 200m rectangular areas and one 35m X 200m area. The longer side of the four rectangles was directed to north-south to obtain the maximum fetch for the prevailing wind direction (south) during the observation period. Each of the four areas was treated by different grazing densities (different sheep numbers in each area) from May1992. The grazing strength of the three 75m X 200m areas was set as 6, 4 and 2 sheep/ha,namely "Heavy grazing site", "Medium grazing site" and "Light grazing site", respectively. In the Light grazing site,two sheep per hectare were grazed during the grazing period. Grass condition was better than that of natural grassland. The turbulent fluxes of sensible heat, latent heat, CO2 were measured using the Heat balance Bowen ratio method and the Gradient method.本研究设计野外试验(field experiments)，旨在探究放牧强度(grazing strength)对内蒙古半干旱区(semi-arid area)草地退化(grassland degradation)的影响，并明确该区域草地的载畜量(grazing capacity)。试验于1991年秋季启动，持续至1995年秋季。 在奈曼站(Naiman Station)东北1.6千米处的典型草地区域，该区域曾于1991年开展微气象观测(micro meteorological observation)，于此建立放牧试验样地(experimental grazing section)，样地为260米×200米的矩形区域(rectangular area)。 该试验场地通过铁丝网围栏(barbwire fence)划分为4个矩形区域，其中3个区域尺寸为75米×200米，剩余1个区域尺寸为35米×200米。 为使观测期间对应盛行风向(prevailing wind direction，南风)的风区长度(fetch)达到最大，4个矩形区域的长边均设置为南北走向。 自1992年5月起，对4个区域分别施加不同的放牧密度(grazing densities，即各区域内放牧绵羊数量不同)。 3个75米×200米的样地放牧强度分别设定为6、4、2羊/公顷，依次对应重度放牧样地("Heavy grazing site")、中度放牧样地("Medium grazing site")与轻度放牧样地("Light grazing site")。 在轻度放牧样地中，放牧期间的放牧密度为2羊/公顷。 该轻度放牧样地内的草地状况优于天然草地。 本研究采用波文比-能量平衡法(Heat balance Bowen ratio method)与梯度法(Gradient method)，对感热(sensible heat)、潜热(latent heat)与二氧化碳(CO2)的湍流通量(turbulent fluxes)进行观测。

搜集汇总

背景与挑战

背景概述

该数据集是 JapanFlux2024 项目的一部分，专注于内蒙古半干旱草原轻度放牧（放牧密度为 2 只羊/公顷）的长期生态观测。它通过热平衡鲍恩比法和梯度法测量感热、潜热和 CO2 湍流通量，旨在研究放牧强度对草原退化的影响，数据覆盖 1992 年至 1994 年，空间位置固定在北纬 42.933919°、东经 120.709606°。