本文選題：黃土丘陵區(qū) + 退耕年限��； 參考：《西北農(nóng)林科技大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年06期

【摘要】：【目的】研究黃土丘陵區(qū)不同退耕年限林地有機(jī)碳及全氮的差異性,分析全氮及有機(jī)碳與環(huán)境和土壤因子的關(guān)系,為該區(qū)域生態(tài)恢復(fù)與土壤質(zhì)量評(píng)價(jià)提供科學(xué)參考�！痉椒ā拷Y(jié)合野外調(diào)查和室內(nèi)分析,運(yùn)用統(tǒng)計(jì)分析及冗余分析方法(RDA),以耕地(CL)為對(duì)照,對(duì)黃土丘陵區(qū)退耕種植25,35,40年的檸條(Caragana korshinskii Lam.,CK)、刺槐(Robinia pseudoacacia L.,RP)林地(以下分別用CK25a、CK35a、CK40a、RP25a、RP35a、RP40a表示)為研究對(duì)象,分別采集各樣地0~10,10~20,20~30cm土層的土樣,研究0~30cm土層有機(jī)碳、全氮含量及有機(jī)碳密度、全氮密度、微生物生物量碳、微生物生物量氮隨退耕年限的變化特征,最后分析了土壤有機(jī)碳、全氮含量及有機(jī)碳密度、全氮密度與環(huán)境因子、土壤因子的關(guān)系�！窘Y(jié)果】與耕地相比,不同退耕年限刺槐、檸條林地0~30cm土層土壤有機(jī)碳、全氮、微生物生物量碳、微生物生物量氮含量及有機(jī)碳密度、全氮密度顯著增加,在0~30cm土層,有機(jī)碳、全氮、微生物生物量碳和微生物生物量氮含量由大到小依次為RP40aRP35aRP25aCL;有機(jī)碳密度從高到低依次為CK35aCK40aCK25aCL;全氮密度由大到小依次是CK35aCK25aCK40aCL。對(duì)于不同退耕年限的刺槐和檸條林地,環(huán)境因子中的植被蓋度、退耕年限、坡度均與土壤有機(jī)碳、全氮及有機(jī)碳密度、全氮密度呈正相關(guān),坡向、海拔、土壤體積質(zhì)量、pH均與其呈負(fù)相關(guān)。而土壤因子中的微生物生物量碳、微生物生物量氮、總孔隙度均與有機(jī)碳、全氮及有機(jī)碳密度、全氮密度呈正相關(guān),土壤體積質(zhì)量、pH均與其呈負(fù)相關(guān)�！窘Y(jié)論】土壤有機(jī)碳及全氮含量變化與退耕年限、植被蓋度、坡度及土壤因子存在密切關(guān)系,且植被恢復(fù)使土壤質(zhì)量得到了極大改良。
[Abstract]:[Objective] to study the difference of organic carbon and total nitrogen in forest land in the loess hilly area, analyze the relationship between total nitrogen and organic carbon with environment and soil factors, and provide scientific reference for the ecological restoration and soil quality evaluation in this region. [method] combined with field investigation and indoor analysis, the method of statistical analysis and redundancy analysis (RDA Taking cultivated land (CL) as the control, the cultivated land (Caragana korshinskii Lam., CK) and Robinia pseudoacacia (Robinia pseudoacacia L., RP) for 25,35,40 years were planted in the Loess Hilly Region for the study of the soil samples of the soil layer, respectively. Carbon, total nitrogen and organic carbon density, total nitrogen density, microbial biomass carbon, microbial biomass nitrogen with the change of the years of tillage, and finally analyzed soil organic carbon, total nitrogen content and organic carbon density, total nitrogen density and environmental factors, soil factors. Compared with cultivated land, different years of cultivated locust, Caragana woodland 0~30cm soil layer soil organic carbon, total nitrogen, microbial biomass carbon, microbial biomass nitrogen content and organic carbon density, total nitrogen density significantly increased, in the 0~30cm soil layer, organic carbon, total nitrogen, microbial biomass carbon and microbial biomass nitrogen content from large to small in turn is RP40aRP35aRP25aCL, organic carbon density from high to low to CK35aCK40aCK in turn to be CK35aCK40aCK 25aCL, the total nitrogen density from large to small is CK35aCK25aCK40aCL. for Robinia pseudoacacia and Caragana woodland with different years of cultivated land, the vegetation coverage in the environmental factors, the years of cultivation, the slope are all positively correlated with soil organic carbon, total nitrogen and organic carbon density, total nitrogen density, slope direction, sea pull, soil volume quality, and pH are negatively correlated. Microbial biomass carbon, microbial biomass nitrogen and total porosity were positively correlated with organic carbon, total nitrogen and organic carbon density, total nitrogen density, soil volume quality and pH. [Conclusion] the change of soil organic carbon and total nitrogen content is closely related to the years of tillage, vegetation coverage, slope and soil factors. The restoration of the soil has greatly improved the quality of the soil.
【作者單位】： 西北農(nóng)林科技大學(xué)農(nóng)學(xué)院;陜西省循環(huán)農(nóng)業(yè)工程技術(shù)研究中心;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41301601) 國(guó)家林業(yè)公益性行業(yè)科研專項(xiàng)(201304312)
【分類號(hào)】：S714

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