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1、應(yīng)用生態(tài)學(xué)報(bào)2014年3月第25卷第3期ChineseJournalofAppliedEcology,Mar.2014,25(3):687—694施肥對(duì)內(nèi)蒙古短花針茅荒漠草原土壤呼吸的影響趙巴音那木拉紅梅梁存柱包烏云張佳鑫(內(nèi)蒙古農(nóng)業(yè)大學(xué)生態(tài)環(huán)境學(xué)院,呼和浩特010019;內(nèi)蒙古大學(xué)生命科學(xué)學(xué)院,呼和浩特010021)摘要2012年在內(nèi)蒙古短花針茅荒漠草原設(shè)置了3個(gè)N肥水平(2.5、5和l0gN·m)的不同NPK配施樣地,并以未施肥樣地為對(duì)照(CK),采用LI.8100土壤碳通量測(cè)量系統(tǒng)測(cè)定了樣地中土壤呼吸速率的日動(dòng)態(tài)和季節(jié)
2、變化,分析土壤呼吸速率與環(huán)境因子的關(guān)系.結(jié)果表明:在植物生長(zhǎng)旺盛期(8月),3個(gè)N肥水平中,10gN·m處理的土壤呼吸速率顯著高于其他處理,5和2.5gN·m處理的土壤呼吸速率與CK無顯著差異.在植物生長(zhǎng)初期和中期(5—9月),施P肥有利于提高土壤呼吸速率.施肥并未改變荒漠草原土壤呼吸的日動(dòng)態(tài)和季節(jié)變化特征.各處理日變化最高值和最低值分別出現(xiàn)在10:00—14:00和03:O0一】5:O0;季節(jié)動(dòng)態(tài)的峰值均出現(xiàn)在8月.土壤呼吸速率與5cm土壤溫度及0~10em土壤含水量顯著相關(guān),其決定系數(shù)分別在0.40—0.58和0.51~
3、0.70,說明表層土壤含水量是制約土壤呼吸變化的主要環(huán)境因子.關(guān)鍵詞土壤呼吸速率施肥環(huán)境因子短花針茅荒漠草原文章編號(hào)1001—9332(2014)03—0687—08中圖分類號(hào)S158.3文獻(xiàn)標(biāo)識(shí)碼AEfectoffertilizationonsoilrespirationintheStipabrevifloradesertsteppeofInnerMongo-lia.ZHA0Bayinnamula,H0NGMei,LIANGCun.zhu,BAOWuyun,ZHANGJia.xin(InnerMongoliaAgricul
4、turalUnive~ity,Hohhot010019,China;InnerMongoliaUniversity,Hohhot010021,Cina)..CJ.App1.Eco1.,2014,25(3):687—694.Abstract:In2012,afieldexperimentwithdifferentfertilizertreatmentswasconductedintheStipabrevfloradesertsteppeofInnerMongolia.TheLI.8100wasusedtoinvestigate
5、dailyandseasonalvariationsofsoilrespirationrate,andtherelationshipsbetweensoilrespirationrateandenvironmen.talfactorswereanalyzed.Theresultsshowedthat:1)Intherapidlygrowingstage(August),therespirationratein10gN·mwassignificantlyhigherthanintheothertreatments.Nosign
6、ificantdifferenceswereobservedamong5gN·m一.2.5gN·m一andCK.2)Duringtheearlyandmiddlegrowingstage(MaytoSeptember),Pfertilizerimprovedthesoilrespirationrate.3)Fertili—zationdidnotchangethedailyandseasonalvariationsofsoilrespiration.Thedailyvariationsofsoilrespirationofa
7、llfertilizationtreatmentswerealmostthesame,withthehighestvaluesoccurringwithin10:00—14:00andthelowestvaluesoccurringwithin03:00—05:00.ThepeakofseasonalvariationoccurredinAugust.41Thesoilrespirationratewassignificantlyrelatedtosoiltempera—tureat5cmdepthandsoilmoistu
8、reat0—10emdepth.a(chǎn)ndthedeterminedcoefficientswereO.4O一0.58and0.5l一0.70.respectively.indicatingthatsoilmoisturewasthemajorfactoraffec.ringsoilrespi