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5 results for “Rocky desertification”
Karst Rocky Desertification in Guizhou,China
<p>Building a high-precision, stable, and universal automatic extraction model of rocky desertification information is the premise for exploring the spatiotemporal evolution of rocky desertification. Taking Guizhou province as the research area and based on MODIS and continuous forest inventory data in China (NFCI), we used a machine learning algorithm (SVM) to build a rocky desertification model with bedrock exposure rate, temperature difference, humidity, and other characteristic factors and improved the model accuracy from the spatial and temporal dimensions. </p>
Distribution pattern of rocky desertification in southwest China and analysis of its main driving factors based on GIS and Geodetector
<p>Rocky desertification, a pressing environmental concern in Southwest China, significantly impacts local living conditions and regional sustainability. Employing remote sensing on a macro scale, this study focuses on identifying and analyzing the spatial distribution and driving factors of rocky desertification. Conducted in Southwest China, using Landsat data from Google Earth Engine for 2020, the research quantitatively extracts information on rocky desertification patches through traditional methods. Excluding unlikely areas using land use data, spatial distribution features and driving factors are examined via GIS spatial analysis and a geodetector model. The main conclusions are as follows. Rocky desertification covers 217,530.4 km<sup>2</sup> (accounting for 15.6% of Southwest China), with areas of slight, moderate, and severe rocky desertification at 81.3%, 7.1%, and 11.6%, respectively. Spatially, rocky desertification primarily occurs in areas where lithology is carbonate rock between clastic rocks and continuous limestone, slope exceeds 15°, elevation ranges is 1000–2000 m, land use types are grassland and woodland, precipitation is 80–120 mm, and population density is below 50 people/km<sup>2</sup>. Human activities have minimal influence. Geodetector analysis identifies lithology, land use type, and slope as primary driving factors, with interactive effects of lithology and land use type and slope and land use type jointly influencing rocky desertification formation in Southwest China.</p>
Effects of rocky desertification habitat on main secondary metabolites of Akebia trifoliata
<p>In recent years, <i>Akebia trifoliata</i> used to restore rocky desertification environment. We first discovered that the medicinal content of<i> A</i><i>. trifoliata</i> will increase in rocky desertification habitats, but its mechanism of action is not clear. In this study, <i>A. trifoliata</i> was planted in normal habitats and rocky desertification habitats, and changes in the content of secondary metabolites and related enzyme activities were analyzed. The results showed that: (1) the biomass of the roots, stems and leaf of <i>A. trifoliata</i> reduced significantly, but the content of secondary metabolites increased significantly in rocky desertification habitats. It is mainly reflected in the content of tannins in leaves, flavonoids in roots, and total phenols in roots, stems and leaves. (2) <i>A</i><i>. trifoliata</i> changed the enzyme activities of PAL (Phenylalanine ammonialyase), C4H (Cinnamate-4-Hydroxylase) and 4CL (4-Coumarate: Coenzyme A Ligase), thereby regulated the increase in the content of secondary metabolites in rocky desertification habitat. (3) the content of medicinal components of <i>A. trifoliata</i> increased significantly in rocky desertification habitat. The highest content of oleanolic acid in the roots from July to August, and the highest content of α-hederagenins in the stems in July; (4) principal component analysis showed that the main response index of <i>A. trifoliata</i> secondary metabolites and related enzymes in rocky desertification habitats was total phenols. This study revealed the response mechanism of <i>A</i><i>. trifoliata</i> secondary metabolites and related enzymes in rocky desertification habitats. It not only provided a new choice for the exploiting of medicinal resources of <i>A. trifoliata</i>, but also provided a new theoretical basis for <i>A. trifoliata</i> to restore rocky desertification environment.</p>
Effects of rocky desertification habitat on main secondary metabolites of Akebia trifoliata
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Distribution pattern of rocky desertification in southwest China and analysis of its main driving factors based on GIS and Geodetector
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