Xiao Hao Yan, Liu Bao, Yu Zai Peng, Wan Xiao Hua, Sang Chang Peng, Zhou Fu Wei, Huang Zhi Qun
Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China.
College of Geographical Science, Fujian Normal University, Fuzhou 350007, China.
Ying Yong Sheng Tai Xue Bao. 2016 Apr 22;27(4):1031-1038. doi: 10.13287/j.1001-9332.201604.029.
Forest types have significant effects on the availability and dynamics of soil dissolved organic carbon (DOC) and dissolved organic nitrogen (DON). By now the impacts of forest types on soil DOC and DON were mainly focused on surface soil (0-10 cm). Based on the comparisons between natural forest, Phyllostachys pubescens, Castanopsis kawakamii and Cunninghamia lanceolata plantations, we investigated the effects of forest types on soil DOC and DON pools in top (0-10 cm) and deep soils (40-60 cm). Cold water, hot water and KCl solutions were used to extract soil DOC and DON from surface and deep soils. Results showed that the effects of forest types on soil DOC, DOC/TOC, DON and soil microbial biomass carbon were only significant in the surface soil. The concentrations of DOC and DON varied with extract methods and hot water extracted the largest amounts of DOC and DON, and cold water the least. Correlations among hot water, KCl and cold water extracted DOC and DON were significant, suggesting that the organic C and N released by these three solutions might be at least partly from similar pools. The concentrations of DOC and DON and DOC/TOC in surface soil under natural forest and P. pubescens were greater than under C. kawakamii and C. lanceolata. It indicated that the concentrations of DOC and DON were greater under the natural forest and P. pubescens than under the C. kawakamii and C. Lanceolata, and more beneficial to improve soil fertility.
森林类型对土壤溶解有机碳（DOC）和溶解有机氮（DON）的有效性及动态变化具有显著影响。到目前为止，森林类型对土壤DOC和DON的影响主要集中在表层土壤（0 - 10厘米）。基于天然林、毛竹林、格氏栲林和杉木人工林之间的比较，我们研究了森林类型对表层（0 - 10厘米）和深层土壤（40 - 60厘米）中土壤DOC和DON库的影响。使用冷水、热水和氯化钾溶液从表层和深层土壤中提取土壤DOC和DON。结果表明，森林类型对土壤DOC、DOC/TOC、DON和土壤微生物生物量碳的影响仅在表层土壤中显著。DOC和DON的浓度随提取方法而变化，热水提取的DOC和DON量最大，冷水提取的量最少。热水、氯化钾和冷水提取的DOC和DON之间的相关性显著，这表明这三种溶液释放的有机碳和氮可能至少部分来自相似的库。天然林和毛竹林下表层土壤中DOC、DON和DOC/TOC的浓度高于格氏栲林和杉木人工林下的浓度。这表明天然林和毛竹林下DOC和DON的浓度高于格氏栲林和杉木人工林下的浓度，且更有利于提高土壤肥力。
