生态学报2018，Vol.38Issue(7)：2262-2270,9.DOI:10.5846/stxb201704110637
子午岭典型植被凋落叶-土壤养分与酶活性特征
Soil enzyme activities, soil and leaf litter nutrients of typical vegetation in Ziwuling Mountain
摘要
Abstract
In China,vegetation restoration is an effective way of protecting soil from erosion and ensuring water conservation on the Loess Plateau.Soil nutrients and enzyme activities are sensitive parameters for assessment of soil remediation through vegetation restoration.Thcre are positive relationships between leaf litter and soil nutrient contents.This study aimed to provide scientific basis for plant selection,and to evaluate the effectiveness of plant selection for vegetation restoration.We collected the soils and leaf litter under five main forest communities of Ziwuling Mountain and analyzed basic soil physical and chemical properties,enzyme activities (urease,sucrase and alkaline phosphatase),and leaf litter nutrients.Statistical analyses were conducted using Analysis of Variance and using Pearson correlation analysis hoping to reveal the driving factors of the differences between soil enzyme activities under different vegetation types.The results showed that:(1) In leaf litter:soil total nitrogen (TN) content of the soil under Robinia pseudoacacia and Quercus wutaishanica vegetation types were 17.10g/kg and 16.26g/kg,respectively,which were higher than the other vegetation types.Total phosphorus (TP)content of the soil under Q.wutaishanica was the highest (1.83g/kg),while soil organic carbon (SOC) content was the highest (501.02g/kg) under the Pinus tabuliformis vegetation.(2) For soil samples,the soil under R.pseudoacacia had the lowest SOC (6.76g/kg) and TN (0.70g/kg) contents,had the highest TP content (0.61g/kg).The Quercus wutaishanica had highest SOC (19.18g/kg) and TN (1.60g/kg) contents,but had the lowest content TP (0.55g/kg).(3) For soil enzyme activities,alkaline phosphatase activity was in the order of Platycladusorientalis ＞P.tabuliformis ＞B.platyphylla ＞ Q.wutaishanica ＞ R.pseudoacacia.Urease activity followed a different order:Q.wutaishanica ＞P.orientalis ＞ B.platyphylla ＞ P.tabuliformis ＞ R.pseudoacacia,while sucrase activity was in the order of P.orientalis ＞Q.wutaishanica ＞ P.tabuliformis ＞ B.platyphylla ＞ R.pseudoacacia.(1) Comparing the C,N,and P contents and C/N ratios of leaf litter and soils of the five main forest communities,revealed that the decomposition rate of leaf litter of R.pseudoacacia was the fastest,while that of leaf litter of P.tabuliformis was the slowest.Though leaf litter of R.pseudoacacia had higher decomposition rate than other forests and released most of the nutrients,little nutrients entered into soil and it was not conducive to store and accumulate nutrients in forest soil.R.pseudoacacia specie of plantation forests may be unconsidered in Ziwuling Mountain.(2) In the zone,soil enzyme activity is mainly affected by vegetation types,soil carbon,nitrogen,bulk density and pH,and no significant correlation with phosphorus.In the process of vegetation restoration and artificial afforestation,the increasing of soil carbon and nitrogen contents are main factors to improve the soil enzyme activity.(3) Although artificial afforestation can improve enzyme activity and soil fertility,however,it has not reached the natural level of secondary forest.关键词
子午岭/凋落叶/土壤酶活性/天然次生林/人工林Key words
Ziwuling Mountain/leaf litter/soil enzyme activities/natural secondary forest/plantation forest引用本文复制引用
张海鑫,曾全超,安韶山,王宝荣,白雪娟..子午岭典型植被凋落叶-土壤养分与酶活性特征[J].生态学报,2018,38(7):2262-2270,9.基金项目
国家自然科学基金面上项目(41671280) （41671280）
国家十二五科技支撑计划(2015BAC01B01-01) （2015BAC01B01-01）
水利部公益性行业科研专项经费项目(201501045) （201501045）
