PDF(Pubmed)
Abstract：
As global ecological degradation intensifies, the long-term impacts of afforestation on productivity and soil fertility in barren lands have become critical in improving global ecological security and productivity. Through meta-analysis, this study integrates data from 109 barren land afforestation sites across China, aiming to comprehensively analyze the effects on plant productivity and soil fertility while identifying the key environmental drivers of these changes. We found that afforestation consistently enhances plant productivity across 60 years. However, soil fertility and moisture initially surged significantly after afforestation but gradually declined after the first decade, indicating the limited long-term benefits. Climatic factors, namely precipitation and humidity index, are crucial in enhancing plant productivity, while geographic factors, specifically lower elevations and gentler slopes, are associated with greater increases in soil fertility. Elevation and slope are two key factors that influence soil moisture after afforestation. These findings highlight the need for ongoing soil management and ecological maintenance in afforestation projects to sustain the soil fertility benefits. Our study provides a robust scientific foundation for afforestation strategies aimed at barren land restoration and offers valuable insights for policy formulation in barren land afforestation.
摘要：
随着全球生态退化的加剧，植树造林对贫瘠土地生产力和土壤肥力的长期影响已成为改善全球生态安全和生产力的关键。通过荟萃分析,本研究整合了中国109个贫瘠土地造林点的数据，旨在全面分析对植物生产力和土壤肥力的影响，同时确定这些变化的关键环境驱动因素。我们发现，植树造林可持续提高60年的植物生产力。然而,植树造林后土壤肥力和水分最初显着增加，但在第一个十年后逐渐下降，表明长期利益有限。气候因素,即降水和湿度指数，对提高植物生产力至关重要，虽然地理因素，特别是较低的海拔和较温和的斜坡，与土壤肥力的更大增加有关。海拔和坡度是影响造林后土壤水分的两个关键因素。这些发现强调了在造林项目中进行土壤管理和生态维护以维持土壤肥力效益的必要性。我们的研究为旨在恢复荒地的造林策略提供了坚实的科学依据，并为荒地造林政策制定提供了宝贵的见解。
