Effects of conversion from a natural evergreen broadleaf forest to a Moso bamboo plantation on the soil nutrient pools, microbial biomass and enzyme activities in a subtropical area
Effects of conversion from a natural evergreen broadleaf forest to a Moso bamboo plantation on the soil nutrient pools, microbial biomass and enzyme activities in a subtropical area
复制标题
亚热带天然常绿阔叶林转毛竹林对土壤养分库、微生物量和酶活性的影响
DOI：
10.1016/j.foreco.2018.04.022
复制
发表时间：
2018-08-15
影响因子：
3.7
通讯作者：
Fu, Weijun
中科院分区：
文献类型：
--
作者：
Cai, Xiaoqing;Lin, Ziwen;Fu, Weijun
由于植物植被覆盖和管理方式的改变，将天然林转化为人工林将显着改变土壤的物理化学和生物学特性。然而，这种土地利用变化对土壤养分库和相关酶活性的影响仍不清楚。研究天然万年青阔叶林退耕还林对毛竹林土壤N、P、K库的大小和形态、微生物生物量以及养分循环相关酶活性的影响。从浙江省亚热带地区的4个相邻万年青阔叶林-毛竹种植园对中采集土壤样品。测定了土壤有机碳（SOC）、全氮（TN）、全磷（TP）、全钾（TK）含量及不同形态氮、磷、钾的储量，测定了土壤微生物量碳（MBC）、微生物量氮（MBN）、微生物量磷（MBP）和4种土壤酶（蛋白酶、脲酶、酸性磷酸酶和过氧化氢酶）的含量。结果表明，阔叶林改毛竹林降低了0-20 cm和20-40 cm土壤有机碳的含量和储量，增加了全钾的含量和储量，但仅增加了0-20 cm土壤全氮和全磷的含量和储量（P <0. 05）。这种土地利用方式使土壤NH 4 +-N、NO3- N、树脂磷、NaHCO 3-P1、NaOH-P-i、HCl-P-i、速效钾和缓效钾含量增加，而使水溶性有机氮、NaHCO 3-P-o和NaOH-P-o含量降低（P < 0.05）。土壤微生物生物量、蛋白酶、脲酶、酸性磷酸酶和过氧化氢酶活性显著降低（P < 0.05）。此外，酸性磷酸酶活性与MBP和NaHCO 3-P-o浓度呈正相关，脲酶和蛋白酶活性与MBN和WSON浓度呈正相关（P < 0.01）。可见，天然阔叶林改毛竹林对土壤无机N、P、K库有正效应，对土壤有机N、P库和N、P循环相关酶活性有负效应。因此，需要制定增加有机养分库和微生物活性的管理做法，以减轻土地用途转换后有机养分库的耗竭。
Converting natural forests to plantations would markedly change soil physiochemical and biological properties, as a consequence of changing plant vegetative coverage and management practices. However, the effects of such land-use change on the soil nutrient pools and related enzymes activities still remain unclear. The aim of this study was to explore the effects of conversion from natural evergreen broadleaf forests to Moso bamboo plantations on the pool sizes and forms of soil N, P and K, microbial biomass, and nutrient cycling related enzyme activities. Soil samples from four adjacent evergreen broadleaf forest-Moso bamboo plantation pairs were collected from a subtropical region in Zhejiang Province, China. The soil organic C (SOC), total N (TN), total P (TP) and total K (TK) concentrations and stocks and different N, P and K forms were measured, and the microbial biomass C (MBC), microbial biomass N (MBN), microbial biomass P (MBP) and four soil enzymes (protease, urease, acid phosphatase and catalase) were determined. The results showed that converting broadleaf forests to Moso bamboo plantations decreased the concentration and stock of SOC but increased those of TK in both soil layers (0-20 and 20-40 cm), and such land-use change increased the concentration and stock of TN and TP only in the 0-20 cm soil layer (P < 0.05). This land-use conversion increased the concentrations of NH4+-N, NO3- N, resin-Pi, NaHCO3-P-1, NaOH-P-i, HCl-P-i, available K and slowly available K, but decreased the concentrations of water-soluble organic nitrogen (WSON), NaHCO3-P-o and NaOH-P-o (P < 0.05). Further, this land-use change decreased the microbial biomass and activities of protease, urease, acid phosphatase and catalase (P < 0.05). In addition, the acid phosphatase activity correlated positively with the concentrations of MBP and NaHCO3-P-o, and the activities of urease and protease correlated positively with the concentrations of MBN and WSON (P < 0.01). To conclude, converting natural broadleaf forests to Moso bamboo plantations had positive effects on soil inorganic N, P and K pools, and negative effects on soil organic N and P pools, and on N- and P-cycling related enzyme activities. Therefore, management practices that increase organic nutrient pools and microbial activity are needed to be developed to mitigate the depletion of organic nutrient pools after the land-use conversion.