Spatial variation in grassland vegetation and herbage mass in the Ejina oasis along the Heihe River in the southern Gobi Desert, China

IF 1.1 4区 农林科学 Q3 AGRICULTURE, MULTIDISCIPLINARY
Masae Shiyomi, Jun Chen, Yasuo Yamamura, Yoshimichi Hori
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Abstract

Our study area, Ejina, is located in the southern Gobi Desert, Inner Mongolia, China, where the annual precipitation is <50 mm and the annual potential evaporation is >3,600 mm. The Heihe River flows from the Qilian Range through the study area, and the desert landscape along the river includes oases formed by forests and grasslands. We established a survey area of approximately 1.5 ha in grassland facing a seasonal swamp, a branch of the Heihe River. We posed the following questions in this desert grassland: (1) how do soil water content (SWC) and salinity change with distance from the riverbank? (2) How do vegetation, aboveground biomass, and species richness change with distance from the riverbank? (3) How much can be supplied to grazing animals, and how many animals can be grazed? Our results indicated that (1) the SWC is high within 20 m of the riverbank and low beyond 20 m, the standing biomass is positively correlated with SWC, but there was no evidence of a correlation between salinity and distance to water; the electrical conductivity was high both inland and adjacent to the riparian swamp. (2) Vegetation could be classified to six classes, following a gradient from the riverbank (swamp margin) to the dry inland area beyond 20 m from the riverbank. Species richness and aboveground biomass were highly correlated. Classification result led us to recommend that generalist species tolerant of the distinct moisture gradient in the site be used in restoration efforts. (3) Per-hectare aboveground biomass was 478.93 dry weight (dw) kg, 321.2 ha of equivalent grassland would be required to graze 100 goats annually.

中国南戈壁滩黑河沿岸额济纳绿洲草原植被和草量的空间变化
我们的研究区域额济纳位于中国内蒙古戈壁滩南部,年降水量为 50 毫米,年潜在蒸发量为 3,600 毫米。黑河从祁连山脉流经研究区,沿河的沙漠景观包括由森林和草原形成的绿洲。我们在草原上建立了一个面积约为 1.5 公顷的调查区,该调查区面向黑河的一条支流--季节性沼泽。我们在这片荒漠草原上提出了以下问题:(1) 土壤含水量(SWC)和盐度如何随距离河岸的远近而变化? (2) 植被、地上生物量和物种丰富度如何随距离河岸的远近而变化? (3) 能为放牧动物提供多少水分,以及能放牧多少动物?我们的研究结果表明:(1)在距离河岸 20 米范围内,SWC 值较高,20 米以外较低,立地生物量与 SWC 值呈正相关,但没有证据表明盐度与距离水域的远近有关;内陆和河岸沼泽附近的电导率都较高。(2) 按照从河岸(沼泽边缘)到距离河岸 20 米以外的内陆干旱地区的梯度,植被可分为六个等级。物种丰富度与地上生物量高度相关。分类结果促使我们建议在恢复工作中使用能适应该地明显湿度梯度的通用物种。(3) 每公顷地上生物量为 478.93 干重(dw)千克,相当于每年放牧 100 只山羊需要 321.2 公顷草地。
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来源期刊
Grassland Science
Grassland Science Agricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
2.70
自引率
7.70%
发文量
38
审稿时长
>12 weeks
期刊介绍: Grassland Science is the official English language journal of the Japanese Society of Grassland Science. It publishes original research papers, review articles and short reports in all aspects of grassland science, with an aim of presenting and sharing knowledge, ideas and philosophies on better management and use of grasslands, forage crops and turf plants for both agricultural and non-agricultural purposes across the world. Contributions from anyone, non-members as well as members, are welcome in any of the following fields: grassland environment, landscape, ecology and systems analysis; pasture and lawn establishment, management and cultivation; grassland utilization, animal management, behavior, nutrition and production; forage conservation, processing, storage, utilization and nutritive value; physiology, morphology, pathology and entomology of plants; breeding and genetics; physicochemical property of soil, soil animals and microorganisms and plant nutrition; economics in grassland systems.
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