Huang Ru, Huang Lin, He Bing-Hui, Zhou Li-Jiang, Yu Chuan, Wang Feng
Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Resources and Environment, Chongqing 400715, China.
Huan Jing Ke Xue. 2013 Jul;34(7):2800-8.
To gain a better knowledge of characteristics of soils and provide a scientific basis for soil erosion control in the Three Gorges Reservoir Area, contents of aggregates and total soil organic carbon (SOC), as well as soil active organic carbon fractions including particulate organic carbon (POC), readily oxidized organic carbon (ROC), dissolved organic carbon (DOC), microbial biomass carbon (MBC) in the 0-30 cm soil layer under seven different biological regulated measures were studied by the field investigation combined with the laboratory analysis. Results showed that the content of the SOC and active organic carbon fractions decreased with the increasing soil depth; the content of the SOC and active organic carbon fractions in 0-10 cm was significantly higher than that in 20-30 cm. The stability of soil aggregates were also significantly influenced by biological regulated measures, the content of > 0.25 mm water-stable aggregates in seven types of biological regulated measures was in the order of Koelreuteria bipinnata + Cassia suffruticasa > hedgerows > closed forest > natural restoration > economic forest > traditional planting > control plot, moreover, the content of 0.25 mm water-stable aggregates correlated positively with the content of SOC. Soils under different biological regulated measures all demonstrated fractal features, and soil under the measure of Koelreuteria bipinnata + Cassia suffruticasa was found to have the lowest value of fractal dimension and soil erodiable K, indicating a relatively strong structure stability and erosion-resistant capacity. Negative correlation was observed when compared the content of active organic carbon fractions with the soil erodiable K. It can be concluded that properties of soil can be managed through biological regulated measures; thence had an influence on the soil erosion-resistant capacity.
为更好地了解土壤特性，为三峡库区土壤侵蚀防治提供科学依据，通过野外调查结合实验室分析，研究了7种不同生物调控措施下0—30 cm土层团聚体、土壤有机碳总量（SOC）以及土壤活性有机碳组分，包括颗粒有机碳（POC）、易氧化有机碳（ROC）、溶解有机碳（DOC）、微生物生物量碳（MBC）的含量。结果表明，SOC和活性有机碳组分含量随土层深度增加而降低；0—10 cm土层SOC和活性有机碳组分含量显著高于20—30 cm土层。生物调控措施对土壤团聚体稳定性也有显著影响，7种生物调控措施下>0.25 mm水稳性团聚体含量大小顺序为：复羽叶栾树+决明>绿篱>郁闭林>自然恢复>经济林>传统种植>对照小区，且0.25 mm水稳性团聚体含量与SOC含量呈正相关。不同生物调控措施下的土壤均表现出分形特征，复羽叶栾树+决明措施下土壤的分形维数和土壤可蚀性K值最低，表明其结构稳定性较强、抗侵蚀能力较强。活性有机碳组分含量与土壤可蚀性K呈负相关。可以得出结论，通过生物调控措施可以管理土壤性质，进而对土壤抗侵蚀能力产生影响。
