Wan Xiao-Hua, Huang Zhi-Qun, He Zong-Ming, Hu Zhen-Hong, Yu Zai-Peng, Wang Min-Huang, Yang Yu-Sheng, Fan Shao-Hui
Ying Yong Sheng Tai Xue Bao. 2014 Jan;25(1):12-8.
Based on the comparison between reforested 19-year-old Mytilaria laosensis and Cunninghamia lanceolata plantations on cut-over land of C. lanceolata, effects of tree species transfer on soil dissolved organic matter were investigated. Cold water, hot water and 2 mol x L(-1) KCl solution were used to extract soil dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) from 0-5, 5-10 and 10-20 cm soil layers. In M. laosensis plantaion, the concentrations of soil DOC extracted by cold water, hot water and 2 mol L(-1) KCl solutions were significantly higher than that in C. lanceolata plantation. In the 0-5 and 5-10 cm layers, the concentrations of soil DON extracted by cold water and hot water in M. laosensis plantation were significantly higher than that in C. lanceolata plantation. The extracted efficiencies for DOC and DON were both in order of KCl solution > hot water > cold water. In the 0-5 cm layers, soil microbial biomass carbon (MBC) under M. laosensis was averagely 76.3% greater than under C. lanceolata. Correlation analysis showed that there were significant positive relationships between hot water extractable organic matter and soil MBC. Differences in the sizes of soil DOC and DON pools between the M. laosensis and C. lanceolata forests might be attributed to the quality and quantity of organic matter input. The transfer from C. lanceolata to M. laosensis could improve soil fertility in the plantation.
基于对皆伐杉木迹地上19年生的老挝石梓人工林和杉木人工林的比较，研究了树种更替对土壤溶解有机质的影响。采用冷水、热水和2 mol·L⁻¹KCl溶液从05、510和1020 cm土层中提取土壤溶解有机碳（DOC）和溶解有机氮（DON）。在老挝石梓人工林中，冷水、热水和2 mol·L⁻¹KCl溶液提取的土壤DOC浓度均显著高于杉木人工林。在05 cm和510 cm土层中，老挝石梓人工林冷水和热水提取的土壤DON浓度均显著高于杉木人工林。DOC和DON的提取效率均为KCl溶液>热水>冷水。在05 cm土层中，老挝石梓林下土壤微生物量碳（MBC）平均比杉木林下高76.3%。相关分析表明，热水可提取有机质与土壤MBC之间存在显著正相关。老挝石梓林和杉木林土壤DOC和DON库大小的差异可能归因于有机质输入的质量和数量。从杉木向老挝石梓的更替可以提高人工林土壤肥力。
