Spatial and Temporal Distribution Characteristics of Service Function Importance of Soil and Water Conservation in Hunan Province Based on GIS

Xie Hongjuan; Yang Caihong

doi:10.13961/j.cnki.stbctb.2024.06.026

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Spatial and Temporal Distribution Characteristics of Service Function Importance of Soil and Water Conservation in Hunan Province Based on GIS

- Spatial and Temporal Distribution Characteristics of Service Function Importance of Soil and Water Conservation in Hunan Province Based on GIS
- Bulletin of Soiland Water Conservation Vol. 44, Issue 6, Pages: 248-255(2024)
- 作者机构：
  
  甘肃农业大学林学院,甘肃,兰州,730070
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2024.06.026
  CLC： S157;X171.4
- Published：2024
- 稿件说明：
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Xie Hongjuan, Yang Caihong. Spatial and Temporal Distribution Characteristics of Service Function Importance of Soil and Water Conservation in Hunan Province Based on GIS[J]. Bulletin of Soiland Water Conservation, 2024, 44(6): 248-255.
DOI：

Xie Hongjuan, Yang Caihong. Spatial and Temporal Distribution Characteristics of Service Function Importance of Soil and Water Conservation in Hunan Province Based on GIS[J]. Bulletin of Soiland Water Conservation, 2024, 44(6): 248-255. DOI： 10.13961/j.cnki.stbctb.2024.06.026.

摘要

[目的

]

探讨湖南省水土保持服务功能的时空变化规律，旨在为湖南省水土保持服务功能评估及制定区域生态综合治理方案提供科学依据。[方法

]

选择NPP植被净初级生产力、DEM高程、土壤质地分布3个因子，采用NPP定量指标评估模型，通过ArcGIS开展了湖南省2000，2005，2010，2015，2020年水土保持服务功能的时空分布特征的研究。[结果

]

①湖南省2000—2020年植被净初级生产力平均值为4.39～334.52 g/(m

·a)(以C计)之间，在时间上呈上升趋势。在空间上，植被净初级生产力平均值呈现中间较高且向四周递减的变化趋势；海拔高程介于-12～2 081 m之间，呈现西高东低的趋势，西部区域起伏较大，东部区域相对平缓；坡度介于3.3°～76.7°之间，呈现西高东低的趋势；土壤可蚀性值介于0.011～1.411之间，土壤可蚀性呈现中间低四周高的趋势，由中心区域向四周扩散并提高。②湖南省2000—2020年水土保持量介于8.75～185.97 t/hm

之间，在时间上呈上升趋势，在空间上以一般重要区和重要区为主，一般重要区面积随时间变化呈下降趋势，重要区面积随时间呈上升趋势，极重要区面积随时间呈下降趋势。水土保持服务功能随时间由一般重要区、极重要区向重要区过渡。[结论

]

植被净初级生产力呈上升趋势，是导致水土保持服务功能上升的主要原因。

Abstract

[Objective] The temporal and spatial variations in the soil and water conservation service functions in Hunan Province were explored

in order to provide a scientific basis for evaluating these functions and formulating a regional ecological management plan. [Methods] Three factors of net primary productivity (NPP) of vegetation

digital elevation model elevation

and soil texture distribution were selected

and the spatial and temporal distribution characteristics of soil and water conservation service functions in Hunan Province were studied based on ArcGIS for the years 2000

2005

2010

2015

and 2020 using the NPP quantitative index evaluation model. [Results] ① From 2000 to 2020

the average net primary productivity of vegetation in Hunan Province ranged from 4.39 to 334.52 g/(m2·a) (calculated by C)

showing an upward trend over time. Spatially

the average net primary productivity was higher in the middle and decreasing towards the edges. The elevation varied from -12 to 2

081 m

exhibiting a trend of being high in the west and low in the east

with significant fluctuations in the west and relatively gentle terrain in the east. The slope ranged from 3.3° to 76.7°

showing a trend of being higher in the west and lower in the east. The soil erodibility values ranged from 0.011 to 1.411

indicating that soil erodibility tends to be low in the middle and high towards the edges

spreading and improving from the central area to surrounding regions. ② From 2000 to 2020

the amount of soil and water conservation in Hunan Province ranged from 8.75 to 185.97 t/hm2

demonstrating an upward trend over time

primarily in general important and important regions. The area of general important region showed a downward trend over time

while the area of important region showed an upward trend

and the area of extremely important regions exhibited a downward trend. The service function of soil and water conservation transitioned from generally important and extremely important regions to important regions over time. [Conclusion] The increase in net primary productivity of vegetation is the primary reason for the enhancement of soil and water conservation service functions.

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