黄土高原撂荒草地土壤碳库对两年增温增雨的响应
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西北农林科技大学农学院

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国家林业和草原局林草科技创新发展与研究项目(2020132111);国家自然科学基金(41877543)


Responses of Soil Carbon Pool Characteristics of Abandoned Grassland on the Loess Plateau to Two-year Warming and Precipitation
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College of Agronomy,Northwest A F University

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Innovation and Development of Science and Technology for Forest grass of National Forest and Grassland Administration(No. 2020132111),National Natural Science Foundation of China (No. 41877543).

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    摘要:

    【目的】阐明暖湿的气候趋势下黄土高原土壤有机碳库不同活性组分和碳库稳定性的变化特征,对脆弱生态区碳库的可持续发展以及评估区域生态效益具有重要意义。【方法】以黄土丘陵区自然撂荒草地为研究对象,人工模拟增温和增雨,分析了在增温(W)、增雨(P50%)及其交互作用(WP50%)下植被群落变化特征、土壤有机碳库组分含量、碳库组分的分配比例以及碳库稳定性的变化特征。【结果】发现:(1)增雨显著增加了植被丰富度指数,而增温和增温增雨显著降低了植被丰富度指数。(2)增雨处理下土壤总有机碳、酸解有机碳、易氧化有机碳、溶解性有机碳含量及分配比例在两个取样年均显著高于对照;增温增雨处理进一步增加了土壤易氧化有机碳和微生物生物量碳含量以及分配比例。相关性分析表明,土壤总有机碳与各个活性碳组分之间互相存在显著相关性。(3)增温增雨处理下土壤碳库活度、碳库活度指数以及碳库管理指数均高于其他处理。酸解有机碳和微生物生物量碳的敏感指数在气候变化处理下相对较高。【结论】综上所述,暖湿化的气候背景下黄土丘陵区撂荒草地土壤总有机碳、有机碳活性组分含量和分配比例以及碳库稳定性显著提高,有助于碳库良性发展,酸解有机碳和微生物生物量碳可作为未来土壤有机碳变化的重要指示。

    Abstract:

    【Objective】Global climate change has had a huge impact on the carbon pool of terrestrial ecosystems, and the changes in average temperature and precipitation patterns pose severe challenges to the management of terrestrial carbon pools. This is especially serious in the Loess Plateau where the ecological environment is fragile. Therefore, understanding the changes of different fractions of soil organic carbon pool and the stability of this carbon pool under the background of the warming and humid climate of the Loess Plateau is of great significance. This will be of importance in the sustainable development of the carbon pool in fragile ecological areas and the evaluation of regional ecological benefits.【 Method】In this study, natural abandoned grassland in the loess hilly region was taken as the research object. Soil warming and increased precipitation were artificially simulated and the changes in vegetation community, soil carbon fractions content and distribution, carbon pool stability index under warming (W), precipitation (P50%) and their interactions (WP50%) were analyzed. 【Result】The results showed that: (1) P50% significantly increased the vegetation Gleason richness index, W and WP50% significantly reduced the Gleason richness index(P < 0.05)and the leaf organic carbon content under the WP50% was significantly higher than the control treatment. Both P50% and WP50% treatments reduced the Shannon-wiener diversity index and pielou evenness index. (2) Soil organic carbon (SOC), acid hydrolyzable organic carbon (AHC), easily oxidizable carbon(EOC), dissolved organic carbon(DOC)content and their distribution ratio of the two sampling years under P50% were significantly higher than the control treatment. Also, warming based on P50% can further increase soil EOC, microbial biomass carbon(MBC)content and distribution ratio. However, only the soil MBC showed a significant difference compared with the control under W treatment. Recalcitrant organic carbon (ROC) presents an opposite trend to AHC. The correlation analysis showed that there was a significant correlation between soil total organic carbon and each active carbon fractions(P < 0.05). (3) The soil carbon pool activity (CA), carbon pool activity index (CAI), and carbon pool management index (CPMI) under WP50% treatment were higher than other treatments. The sensitivity index of AHC and MBC was relatively high under the treatment of climate change.【Conclusion】In summary, the total organic carbon, the content and distribution ratio of active fractions of organic carbon, and the stability of the carbon pool in abandoned grassland of the loess-hilly area will be significantly improved under background warming and humid climate. This will contribute to the healthy development of the carbon pool. From a sensitivity point of view, AHC and MBC can be used as early important indicators of changes in soil organic carbon under warm and humid climates in the future. This study provides a theoretical and scientific basis for research on climate change and carbon pool management in fragile ecological areas.

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王兴,钟泽坤,王佳懿,简俊楠,杨改河,任成杰,韩新辉.黄土高原撂荒草地土壤碳库对两年增温增雨的响应[J].土壤学报,,[待发表]
WANG Xing, ZHONG Ze-kun, WANG Jia-yi, JIAN Jun-nan, YANG Gai-he, REN Cheng-jie, HAN Xin-hui. Responses of Soil Carbon Pool Characteristics of Abandoned Grassland on the Loess Plateau to Two-year Warming and Precipitation[J]. Acta Pedologica Sinica,,[In Press]

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