生态学报2017，Vol.37Issue(1)：84-92,9.DOI:10.5846/stxb201607291557
森林转换对地表径流可溶性有机碳输出浓度和通量的影响
Effects of forest conversion on concentrations and fluxes of dissolved organic carbon in runoff
摘要
Abstract
In order to elucidate the relationships between runoff parameters and variation in rainfall,we compared the volume,dissolved organic carbon (DOC) concentration,and DOC flux of runoff from Castanopsis carlesii (C.carlesii)secondary forest (SF) and from SF plots converted to young plantation (BC) or assisted naturally regenerated young forest (NR) after individual rainfall events.Our results indicated that the volume of the BC runoff was 1.5 to 19.0 times that that of the SF runoff,depending on the specific rainfall event.The total accumulated volume of the BC runoff during the research period was 5.9 times that of the SF runoff.However,neither the per-event nor the accumulated volume of the NR runoff differed significantly from those of the SF runoff.Meanwhile,the DOC concentration of the NR,BC,and SF runoff ranged from 5.9 to 18.4 mg/L,4.3 to 13.5 mg/L,and 3.2 to 9.9 mg/L,respectively,and the mean DOC concentration of the SF runoff (12.6 mg/L) was 1.6 times that of the NR runoff (7.6 mg/L) and 2.4 times that of the BC runoff (5.3 mg/L).Regression analysis indicated that the DOC concentration of runoff water was significantly related to pre-rain soil water content,and DOC concentration was observed to increase with soil water content when the pre-rain soil water content was lower than 20.8％,and to decrease with soil water content when the pre-rain soil water content was higher than 20.8％.In addition,the DOC flux of the BC runoff was 0.7 to 5.4 times that of the SF runoff,and the total accumulated DOC flux from the BC runoff was 2.1 times that of the SF runoff.However,differences between the DOC flux of the NR and SF runoff were insignificant (P＞0.05),and for all three forests,the DOC flux was significantly (P＜0.05) related to rainfall.Therefore,the conversion of SF to BC reduced the DOC concentration of the runoff,but increased overall DOC flux owing to dramatic increases in runoff volume,whereas the conversion of SF to NR had no significant effects on DOC flux owing to the runoff's relatively low DOC concentration and volume.关键词
森林转换/地表径流/可溶性有机碳Key words
forest conversion/runoff/dissolved organic carbon引用本文复制引用
胥超,林成芳,刘小飞,熊德成,林伟盛,陈仕东,谢锦升,杨玉盛..森林转换对地表径流可溶性有机碳输出浓度和通量的影响[J].生态学报,2017,37(1):84-92,9.基金项目
国家自然科学基金重点项目(31130013) （31130013）
国家自然科学基金联合基金重点支持项目(U1505233) （U1505233）
