摘要
以南京溧水林场间伐10年后的30年生马尾松(Pinus massoniana)人工林为对象,研究了不同间伐强度(对照,未间伐,CK;弱度间伐,LIT,25%;中度间伐,MIT,45%;强度间伐,HIT,65%)对根际土壤磷组分的影响。结果表明,与对照相比,中度间伐显著降低了根际土壤全磷和有机磷含量;强度间伐显著降低了根际土壤无机磷总量,且各处理间差异显著;中度和弱度间伐增加了根际土壤酸性磷酸酶活性以及速效磷、微生物量磷和活性磷含量(H_2O-Pi、NaHCO_3-Pi和NaHCO_3-Po),而显著降低NaOH-Po含量;间伐对稳定态磷含量(HCl-P和残留-P)影响不显著。除稳定态磷外,根际土壤中磷组分含量均大于非根际,具有明显的正根际效应。土壤含水量、pH、有机质含量及酸性磷酸酶活性是影响土壤磷含量的重要因子。弱度和中度间伐有利于提高根际土壤磷的有效性。
We investigated the responses of phosphorus（ P） fractions of rhizosphere soil to thinning in a 30-year-old Pinus massoniana plantation after 10 years of thinning. There were four thinning intensities： control（ CK,0%）,low intensity thinning（ LIT,25%）,moderate intensity thinning（ MIT,45%）,and high intensity thinning（ HIT,65%）. The results showed that MIT significantly reduced the total P and organic P concentrations, whereas HIT significantly decreased the concentrations of inorganic P in the rhizosphere soil. LIT and MIT increased soil acid phosphatase activity,available P,microbial biomass P,and easily-available P（ H2O-Pi,NaHCO3-Pi and NaHCO3-Po） in rhizosphere soil,but decreased Na OH-Po. Thinning had no effect on the non-available P. Except for non-available P,all the P fractions in rhizosphere soil were higher than those in bulk soil,indicating a positive rhizosphere effect. Soil P content was closely correlated with soil moisture,p H,organic matter content and acid phosphatase activity.These results suggest that LIT and MIT improved soil P availability,which could be used as efficient management practices in P. massoniana plantations.
作者
叶钰倩
赵家豪
刘畅
关庆伟
YE Yu-qian1,2,ZHAO Jia-hao1,2,LIU Chang1,2,GUAN Qing-wei1,2(1 Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing 210037, China; 2 College of Biology and the Environment, Nanfing Forestry University Nanjing 210037, China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2018年第5期1364-1370,共7页
Chinese Journal of Ecology
基金
长三角城市群关键生态景观重建修复技术与示范项目(2016YFC0502703)资助
关键词
间伐强度
马尾松人工林
根际土壤
磷组分
酸性磷酸酶
根际效应
thinning intensity
Pinus massoniana plantation
rhizosphere soil
phosphorus fraction
acid phosphatase activity
rhizosphere effect.
