亚热带资源与环境学报
亞熱帶資源與環境學報
아열대자원여배경학보
JOURNAL OF SUBTROPICAL RESOURCES AND ENVIRONMENT
2014年
1期
38-45
,共8页
黄永梅%杨智杰%郭剑芬%吴君君%陈朝琪%王小红%张金凤
黃永梅%楊智傑%郭劍芬%吳君君%陳朝琪%王小紅%張金鳳
황영매%양지걸%곽검분%오군군%진조기%왕소홍%장금봉
隔离降雨%土壤可溶性有机碳%土壤微生物生物量碳%杉木林
隔離降雨%土壤可溶性有機碳%土壤微生物生物量碳%杉木林
격리강우%토양가용성유궤탄%토양미생물생물량탄%삼목림
rainfall exclusion%dissolve organic carbon%microbial biomass carbon%Chinese fir forest
通过在亚热带杉木林内设置不同隔离降雨强度试验:完全隔离降雨、隔离60%降雨、隔离20%降雨和对照(自然降雨),研究隔离降雨对0~20 cm土层可溶性有机碳( DOC)和微生物生物量碳(MBC)含量的影响,结果表明:0~10 cm和10~20 cm土层,除完全隔离降雨处理土壤DOC峰值出现在春季外,其他处理均出现在秋季。0~10 cm土层中完全隔离降雨和隔离60%降雨处理的土壤MBC峰值出现在春季,而隔离20%降雨和对照的则出现在夏季,10~20 cm土层各处理对应的MBC最大值分别出现在春季、夏季、夏季和秋季。随着土层加深,4种处理土壤DOC、 MBC含量均显著降低。0~10 cm土层,完全隔离降雨处理的土壤DOC、隔离60%降雨土壤MBC均与土壤含水量显著正相关,杉木林土壤DOC和MBC对降水变化响应具有明显的季节性。
通過在亞熱帶杉木林內設置不同隔離降雨彊度試驗:完全隔離降雨、隔離60%降雨、隔離20%降雨和對照(自然降雨),研究隔離降雨對0~20 cm土層可溶性有機碳( DOC)和微生物生物量碳(MBC)含量的影響,結果錶明:0~10 cm和10~20 cm土層,除完全隔離降雨處理土壤DOC峰值齣現在春季外,其他處理均齣現在鞦季。0~10 cm土層中完全隔離降雨和隔離60%降雨處理的土壤MBC峰值齣現在春季,而隔離20%降雨和對照的則齣現在夏季,10~20 cm土層各處理對應的MBC最大值分彆齣現在春季、夏季、夏季和鞦季。隨著土層加深,4種處理土壤DOC、 MBC含量均顯著降低。0~10 cm土層,完全隔離降雨處理的土壤DOC、隔離60%降雨土壤MBC均與土壤含水量顯著正相關,杉木林土壤DOC和MBC對降水變化響應具有明顯的季節性。
통과재아열대삼목림내설치불동격리강우강도시험:완전격리강우、격리60%강우、격리20%강우화대조(자연강우),연구격리강우대0~20 cm토층가용성유궤탄( DOC)화미생물생물량탄(MBC)함량적영향,결과표명:0~10 cm화10~20 cm토층,제완전격리강우처리토양DOC봉치출현재춘계외,기타처리균출현재추계。0~10 cm토층중완전격리강우화격리60%강우처리적토양MBC봉치출현재춘계,이격리20%강우화대조적칙출현재하계,10~20 cm토층각처리대응적MBC최대치분별출현재춘계、하계、하계화추계。수착토층가심,4충처리토양DOC、 MBC함량균현저강저。0~10 cm토층,완전격리강우처리적토양DOC、격리60%강우토양MBC균여토양함수량현저정상관,삼목림토양DOC화MBC대강수변화향응구유명현적계절성。
A field experiment was conducted to study effects of rainfall exclusion treatments ( i.e.no rainfall, 60%rainfall reduction, 20%rainfall reduction and control) on soil dissolved organic carbon ( DOC) and microbial biomass carbon ( MBC) contents at the depth of 0~20 cm in a Chinese fir for-est.Results showed that the maximum DOC content at the depth of 0~10 cm and 10~20 cm in no rainfall treatment occurred in spring , while DOC contents in other treatments peaked in autumn .The MBC contents in the 0~10 cm in treatments of no rainfall and 60%rainfall reduction were maximum in spring , while maximum MBC contents in treatments of 20% rainfall reduction and control were in summer .At 10~20 cm depth , seasonal MBC contents in the four treatments were maximum in spring , summer, summer and autumn respectively .Soil DOC and MBC contents in the four rainfall treatments all decreased with the increasing of soil depth .In the 0~10 cm, the DOC content in no rainfall treat-ment and MBC in 60%rainfall reduction treatment were both positively correlated with soil water con-tent.In conclusion, the importance of the seasonal dynamics of DOC and MBC should be noted .