摘要
通过对黄土丘陵区纸坊沟流域退耕37a不同退耕模式的油松+紫穗槐混交林(PA)、油松林(PT)、刺槐林(RP)、柠条林(CKK)及对照样地撂荒地(CK)草本植被进行调查与采样,研究物种多样性、草本盖度、枯落物量、地上及根系生物量、根冠比、根长密度等植被的变化特征。结果表明:1)物种多样性撂荒地最高,柠条林最低,顺序为CK>PA>PT>RP>CKK;2)草本盖度、地上生物量均为撂荒地最高,油松林最低,大小顺序分别为CK>CKK>RP>PA>PT和CK>RP>CKK>PA>PT,方差分析结果显示,植被盖度差异不显著,地上生物量差异极显著(P<0.01);3)样地枯落物量、草本根系生物量均为油松+紫穗槐混交林最高,刺槐林最低,大小顺序分别为PA>CKK>PT>CK>RP和PA>CKK>CK>PT>RP,方差分析结果表明,枯落物量未达显著差异,根系生物量差异显著(P<0.05);4)草本根冠比、根长密度均为油松+紫穗槐混交林最高,撂荒地最低,大小顺序分别为PA>PT>CKK>RP>CK和PA>CKK>RP>PT>CK,且均达显著性差异水平(P<0.05);5)土壤分层地下生物量与植被地上各指标达极显著相关(P<0.01),且呈y=xa幂指数关系。
Taken abandoned farmland（CK） as control,the undergrowth vegetation investigation was conducted on four land-use types of Caragana korshinskii（CKK）,Robinia pseudoacacia（RP）,Pinus tabulaeformis（PT） and mixed forest of Pinus tabulaeformis and Amorpha fruticosa（PA） in the loess hilly region of Zhifanggou watershed.These five kinds of land types were restored for almost 37 years from slope farmland.The variations of vegetation coverage,aboveground and underground biomass,litter amount,ratio of root to shoot and root length density and the relationship among them were studied.After 37 years vegetation restoration and construction,abandoned farmland has the highest value of species diversity,vegetation coverage and aboveground biomass,while Pinus tabulaeformis land has the lowest species diversity,and Caragana korshinskii land has the lowest vegetation coverage and aboveground biomass.The orders of species diversity,vegetation coverage and aboveground biomass were given as follows： CKPAPTRPCKK,CKCKKRPPAPT and CKRPCKKPAPT,respectively.The results of ANOVA showed that there was a significant difference in aboveground biomasses（P〈0.01）,while no difference was found in underground biomass.Mixed forest of Pinus tabulaeformis and Amorpha fruticosa has the highest value of the litter amount and underground biomass,while Robinia pseudoacacia was the lowest.The orders of litter amount and underground biomass were given as follows： PACKKPTCKRP and PACKKCKPTRP,respectively.The results of ANOVA showed that there was a significant difference in underground biomass（P〈0.05）,while no difference was found in litter amount.Mixed forest of Pinus tabulaeformis and Amorpha fruticosa has the highest value of the ratio of root to shoot and root length density,while abandoned farmland was the lowest.The orders of the ratio of root to shoot ratio and root length density were given as follows： PA〉PT〉CK〉KRP〉CK and PA〉CKK〉RP〉PT〉CK,respectively.Root biomasses of different soil layers could be simulated well by indices of aboveground vegetation characteristics with serious of power functions（P〈0.01）.The results of ANOVA showed that there was a significant difference in the ratio of root to shoot（P〈0.05） and root length density（P〈0.05）.
出处
《中国水土保持科学》
CSCD
2012年第5期64-70,共7页
Science of Soil and Water Conservation
基金
中国科学院百人计划项目"土壤侵蚀水动力学"(K318001110)
"十二五"规划农田水土保持项目"梁峁丘陵沟壑区农田耕作及林草生物措施防蚀及关键技术集成与示范"(2011BAD31B05-02)
关键词
退耕模式
植被调查
物种多样性
生物量
根长密度
黄土丘陵区
restoration models
vegetation investigation
species diversity
biomass
root length density
Loess Hilly region
