|Table of Contents|

Lithology and Structure of Ground Substrate and Cover Features of Woody and Herbaceous Plant in Weibei Dry Belt of the Middle Yellow River, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2025年第04期
Page:
765-779
Research Field:
黄河流域生态保护和高质量发展专刊(下)
Publishing date:

Info

Title:
Lithology and Structure of Ground Substrate and Cover Features of Woody and Herbaceous Plant in Weibei Dry Belt of the Middle Yellow River, China
Author(s):
LI Xin-bin1; 2*; YIN Zhi-qiang3; KANG Cheng-xin1; 2; XI Jun-sheng1; 2; ZHAO Hao1; 2; ZHANG Yao1; 2; ZHAO Zi-hao1; 2
(1. Xi'an Mineral Resources Survey, China Geological Survey, Xi'an 710100, Shaanxi, China; 2. Qinling-Loess Plateau Transition Zone Observation and Research Station for Coupling of Soil and Water Elements and Conservation of Biological Resources, Tongguan 714300, Shaanxi, China; 3. Natural Resources Survey, China Geological Survey, Beijing 100055, China)
Keywords:
ground substrate;  lithology and structure;  soil;  fracture density;  vegetation coverage;  normalized difference vegetation index;  net primary productivity;  Yellow River
PACS:
P66
DOI:
10.19814/j.jese.2025.01051
Abstract:
It is of great significance to explore the coupling relationship between the ground substrate and vegetation coverage, and to grasp the heterogeneity characteristics of different lithology and structure of the ground substrate as well as their constraints on vegetation growth for implementing targeted ecological restoration measures and enhancing the effectiveness of vegetation restoration. Based on comprehensive surveys of ground substrate profiles and vegetation ecological quadrats, the heterogeneous characteristics of lithology and structure of ground substrate and their relationships with overlying vegetation community structure and root architecture in Hancheng area of Shaanxi, which is typical in Weibei dry belt of the middle Yellow River, were analyzed; combined with time-series of vegetation ecological indices, the constraining effects of the heterogeneity of lithology and structure of ground substrate on vegetation ecology were explored. The results show that the soil genetic layers in argillaceous rock, clastic rock interbedded with argillaceous rock, alluvial-proluvial sand, and clastic rock ground substrates are structurally intact and thick, vegetation coverage exceeds 80%, and the multi-year average annual net primary production(NPP)from 2000 to 2023 is 378.01-430.77 kg C·m-2·a-1, indicating relatively high level; however, differences in vegetation community structure are observed due to variations in pore, fracture and depth; in carbonate rock, alluvial-proluvial gravel, and granite gneiss ground substrates, the vegetation coverage is less than 50%, and the multi-year average annual NPP is relatively low(156.21-320.04 kg C·m-2·a-1); the granite gneiss ground substrate exhibits excessively developed fractures(the average fracture density is 4.73 m·m-2), and the multi-year average annual NPP(156.2 kg C·m-2·a-1)is primarily contributed by sparsely distributed deep-rooted trees, resulting in the lowest level; in the aeolian loess ground substrate, although the soil layer is thick, the water and nutrient retention capacities are weak due to well-developed vertical joints; the surface is predominantly covered by shrubs and herbaceous plants, with sporadic deep-rooted drought-resistant trees, and the multi-year average annual NPP(378.29 kg C·m-2·a-1)is at a moderate level; a highly significant positive correlation is found between vegetation coverage and the thickness of surface soil of ground substrate(p<0.01), and a significant positive correlation is also observed between vegetation coverage and the density of fissures with a width greater than 1 mm(p<0.05). In general, the lithology and structure of ground substrate(such as material composition, spatial structure and pore fractures)determine the growth and NPP level of the forest and grass on the surface of Weibei dry belt by affecting the growth of vegetation roots and water absorption.

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