不同间伐强度下华北落叶松人工林土壤磷组分特征及其影响因素  

Characteristics of soil phosphorus fractions under different thinning intensities in Larix principis-rupprechtii plantation and the affecting factors

作　　者：刘旭军 程小琴[1] 田慧霞 贾小东 韩海荣[1] LIU Xu-jun;CHENG Xiao-qin;TIAN Hui-xia;JIA Xiao-dong;HAN Hai-rong(Beijing Key Laboratory of Forest Resources and Ecosystem Processes,Beijing Forestry University,Beijing 100083,China;National Forest Administration of Taiyue Mountain,Jiexiu 032000,Shanxi,China)

机构地区：[1]北京林业大学森林资源生态系统过程北京市重点实验室,北京100083 [2]山西省太岳山国有林管理局,山西介休032000

出　　处：《应用生态学报》2018年第12期3941-3948,共8页Chinese Journal of Applied Ecology

基　　金：国家重点研发计划项目(2016YFD0600205) 资助~~

摘　　要：间伐是人工林经营的重要措施,磷是森林生态系统的限制性养分元素之一,但间伐对土壤磷素的影响尚不明确.本研究采用Tissen改良的Hedley磷分级体系对土壤样品进行连续浸提,研究不同间伐强度[对照,未间伐;轻度间伐,15%;中度间伐,35%;重度间伐,50%]下山西太岳山好地方林场华北落叶松人工林表层土壤(0～10 cm)磷组分特征及其影响因素.结果表明:与对照相比,中度间伐显著增强了土壤总无机磷含量;轻度和中度间伐显著增强了Resin-Pi、NaHCO_3-Pi、NaHCO_3-Po、NaOH-Pi、微生物生物量磷和土壤酸性磷酸酶活性,显著降低了NaOH-Po含量;间伐对土壤全磷、总有机磷、稳定态磷(HCl-Pi、浓HCl-Pi和浓HCl-Po)和闭蓄态磷(Residual-P)的影响不显著.土壤有机碳含量、含水率、土壤微生物和酸性磷酸酶活性是影响土壤磷素有效性的重要因子.中度间伐能提高华北落叶松人工林土壤磷素的有效性.Thinning is an important plantation management strategy. Phosphorus (P) is one of the limiting nutrients in forest ecosystems. The impacts of thinning on soil P remain unclear. In this study, we investigated the characteristics of soil P fractions in topsoil (0-10cm) of Larix principis-rupprechtii plantation in Taiyue Mountain, Shanxi Province under different thinning intensity (control, CK, 0%;low thinning, LT, 15%;moderate thinning, MT, 35%;high thinning, HT, 50%) and the affecting factors. The soil P fractions were measured using Tissen modified Hedley P fractionation method. The results showed that the total inorganic P content in soil was significantly higher in stands subjected to moderate thinning than in control. The soil acid phosphatase activity (APA) and the contents of Resin-Pi, NaHCO3-Pi, NaHCO3-Po, NaOH-Pi, and microbial biomass phosphorus (MBP) were significantly increased in LT and MT compared with CK, but the content of NaOH-Po showed an opposite trend. Thinning had no significant effect on soil total P, total organic P, non-available P and residual-P. Soil moisture, organic matter, MBP and APA were the important factors affecting soil P availability. Our results demonstrated that MT could enhance soil P availability in Larix principis-rupprechtii plantation.

关 键 词：间伐 华北落叶松人工林 磷组分 微生物生物量磷 土壤酸性磷酸酶活性 

分 类 号：S714[农业科学—林学]