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选择高密度云杉人工纯林,模拟天然林窗形成方式,开展了低强度林窗式疏伐试验,监测了地表空气温、湿度和不同土壤层次的养分状况.结果表明:疏伐后第1年,生长季(5—9月)林窗内地表日均温升高而日均湿度降低,林窗内土壤腐殖层(O层)有机质(SOM)和铵态氮(NH4+-N)含量分别增加了19.62%和283.85%,硝态氮(NO3--N)和可溶性有机碳(DOC)含量分别减少77.86%和23.60%.而0～10cm土层SOM、全氮(TN)和NO3--N含量分别比对照增加45.77%、37.14%和75.11%;NH4+-N、DOC和全磷(TP)含量分别减少48.56%、33.33%和13.11%.上述结果说明,低强度林窗式疏伐迅速改善了高密度云杉人工纯林地表阴湿的环境,增强了O层土壤微生物活性与土壤矿化过程,促进了土壤养分释放与土壤肥力恢复.
The high density spruce artificial pure forest was chosen to simulate the natural glenillos formation and the low intensity gap shedding test was conducted to monitor the surface air temperature and humidity and nutrient status in different soil layers.The results showed that the first The average daily temperature of the surface in the canopy and the daily average humidity decreased in the year and the growing season (May-September). The content of organic matter (SOM) and ammonium nitrogen (NH4 + -N) in the soil layer (O layer) Increased by 19.62% and 283.85%, respectively, and the contents of NO3 - N and DOC decreased by 77.86% and 23.60%, respectively.The SOM, TN and NO3- -N content increased by 45.77%, 37.14% and 75.11%, respectively, while the content of NH4 + -N, DOC and total phosphorus (TP) decreased by 48.56%, 33.33% and 13.11%, respectively.These results indicated that the low- The environment of hygroscopicity on the surface of high-density Picea mongolica forest was rapidly improved, soil microbial activity and soil mineralization in O-layer were enhanced, and the release of soil nutrients and the restoration of soil fertility were promoted.