Land-Use Effect on Soil Carbon and Nitrogen Stock in a Seasonally Dry Tropical Forest
Land-Use Effect on Soil Carbon and Nitrogen Stock in a Seasonally Dry Tropical Forest
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季节性干旱热带森林土地利用对土壤碳和氮储量的影响
DOI：
10.3390/agronomy10020158
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Antonio Givanilson Rodrigues da Silva
中科院分区：
文献类型：
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作者：
Eunice Maia Andrade;W. Valbrun;A. M. M. D. Almeida;G. Rosa;Antonio Givanilson Rodrigues da Silva
土壤中总有机碳（TOC）和总氮（TN）的含量是土壤退化的一个指标。为了了解土地利用可能会影响这些浓度在季节性干燥的热带森林（SDTF），我们分析了四种土地利用对TOC股票（STK.TOC）和TN股票（STK.TN）在巴西的半干旱地区的影响。在12个沟渠（3个地点× 4个土地利用-密集牧场（DC）、开放牧场（OC）、牧场（PA）和农业（AG））中，在0-10、10-20和20-30 cm土层或直至基岩采集土壤样品。通过Kruskal-Wallis检验（p ≤ 0.05）比较数据，并通过聚类分析研究相似性。表层（0-10 cm）土壤有机质、总有机质和全氮含量在DC、OC和PA土地利用间差异不显著（p ≤ 0.05）。DC、OC和PA的STK、TOC和STK、TN值的相似性表明，在TOC储量很低的新成土上，采用露天草地和牧场利用SDTF生产生物量和蛋白质是可能的。农业土地利用中STK.TOC和STK.TN的最大减少可能导致土壤退化，并有助于向大气中增加CO2。
Total organic carbon (TOC) and total nitrogen (TN) concentration in the soil are an indicator of soil degradation. To understand how land-use may impact these concentrations in seasonally dry tropical forests (SDTF), we analyzed the effect of four land-uses on TOC stocks (STK.TOC) and TN stocks (STK.TN) in a semi-arid region of Brazil. Soil samples were collected in 12 trenches (three sites × four land-uses—dense caatinga (DC), open caatinga (OC), pasture (PA) and agriculture (AG)), in the 0–10; 10–20 and 20–30 cm layers or as far as the bedrock. The data were compared by the Kruskal–Wallis test (p ≤ 0.05) and similarity investigated by cluster analysis. STK.TOC and STK.TN the surface layer (0–10 cm) showed no significant difference (p ≤ 0.05) between the DC; OC and PA land-uses. The similarity in STK.TOC and STK.TN values between DC, OC and PA, indicate that it is possible to explore SDTF to produce biomass and protein by adopting open caatinga and pasture land uses on Neosols with very low TOC stocks. The greatest reduction in STK.TOC and STK.TN in the agriculture land-use may lead to soil degradation and contribute to the addition of CO2 to the atmosphere.