Climate change weakens the positive effect of human activities on karst vegetation productivity restoration in southern China

初级生产 环境科学 植被(病理学) 喀斯特 生产力 植树造林 气候变化 荒漠化 生态系统 归一化差异植被指数 生态学 自然地理学 农林复合经营 地理 生物 医学 宏观经济学 病理 经济 考古
作者
Luhua Wu,Shijie Wang,Xiaoyong Bai,Yichao Tian,Guangjie Luo,Jinfeng Wang,Qin Li,Fei Chen,Yuanhong Deng,Yujie Yang,Zeyin Hu
出处
期刊:Ecological Indicators [Elsevier]
卷期号:115: 106392-106392 被引量:85
标识
DOI:10.1016/j.ecolind.2020.106392
摘要

China has conducted large-scale eco-afforestation projects in karst areas for mitigating rocky desertification in recent decades. However, the benefits of karst vegetation productivity restoration and the contributions of influencing factors are unclear. We analyzed the impacts of climate change (CC) and human activity (HA) on vegetation productivity change based on the net primary productivity (NPP) by using the partial derivatives and designing eight different scenarios. Results demonstrated that the average NPP over the entire vegetation-covered karst area exhibited an unremarkable increasing trend (0.92 g C m−2 yr−1) and a major decline in NPP was detected in the areas where NDVI increased from 2000 to 2015 (0.44 million km2, 29.07%). Solar radiation (−0.91 g C m−2 yr−1) was the preponderant climatic factors exhibiting negative contribution to NPP changes. A significant positive contribution was caused by HA (1.53 g C m−2 yr−1) on NPP variations, while a negative contribution was induced by CC (−0.61 g C m−2 yr−1). CC and HA showed the more similar contribution proportion to NPP increasing (51.94% vs 48.06%), but with great difference (68.43% vs 31.57%) for NPP decreasing. 39.83% of the areas involved in NPP decreasing was attributed to the accelerating consumption of autotrophic respiration while the rest (60.17%) was contributed by rapid decrease of gross primary productivity, respectively. In southern karst area, HA showed a positive impact (59.07%) on NPP increasing. However, the negative contribution from CC (70.72%) due to the rapid and constant decline of solar radiation completely counteracted this, leading to a greater NPP decrease. This study stresses the importance of negative effect from CC on karst vegetation productivity change and provides location guidance for further implementation of ecological protection projects in southern China.
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