摘要
为了探究不同生态治理措施对土壤碳(C)、氮(N)、磷(P)含量及其化学计量特征的影响,为黄土丘陵区的生态治理与植被恢复提供科学依据,以黄土丘陵区典型小流域王茂沟为例,通过野外采样与室内分析相结合的方法,对研究区坡耕地、林地、草地、灌木地及梯田等5个样地0—100cm土壤样品的C、N、P及其化学计量比进行了分析研究。结果表明:(1)坡耕地经过生态治理转变为林地、草地、灌木地及梯田等生态用地,土壤C、N含量分别提高了1.27,1.18,1.24,1.14倍及1.64,1.64,1.76,1.57倍;土壤C和N呈极显著的正相关关系;在0—100cm土层,林地、草地、灌木地及梯田的土壤C、N分布规律一致,均随土壤深度增加而减小,且在0—20cm土层出现了富集现象,而土壤P含量分布比较均匀;(2)坡耕地C∶N均值显著大于其他样地(P<0.05),在0—20cm土层,土壤C∶P与N∶P表现为林地、草地、灌木地及梯田显著高于坡耕地(P<0.05);土壤C∶N随着土层深度的变化不显著,C∶P与N∶P随土层加深呈减小的趋势;(3)土壤C、N、P化学计量比的分布主要由土壤C、N决定;土壤C∶P、N∶P与土壤中铵态氮、粘粒、砂粒、水稳性大团聚体含量之间的相关性均通过了显著性检验(P<0.05)。土壤C、N、P及其化学计量比不仅受生态治理和土层深度的影响,还与土壤理化性质相关,土壤C∶N、C∶P、N∶P可以指示土壤的肥力状况。
In order to explore the effects of different ecological management measures on soil carbon（C）,nitrogen（N）,phosphorus（P）contents and their stoichiometry characteristics,thus to provide scientific evidence for ecological management and vegetation restoration of loess hilly region.By combining the means of field sampling and laboratory analysis,Wangmaogou which was the typical watershed in loess hilly region was taken as an example in this study,and the soil C,N and P contents and their stoichiometry of the 0—100 cm soil layer of 5 kinds of sample plots（sloping farmland,woodland,shrub land,grassland and terrace land）were analyzed.The results showed that：（1）Transformed into woodland,shrub land,grassland and terrace land by ecological management measures,soil C and N contents of sloping farmland respectively increased by 1.27,1.18,1.24,1.14 times and 1.64,1.64,1.76,1.57 times;There were significant positive correlation between soil C and N.The vertical distribution of the soil C and N in the 0—100 cm soil profile of woodland,grassland,shrub land and terrace land were quite consistent,showing the same trend of decreasing with soil depth and both appearing enrichment phenomenon in the 0—20 cm soil layer,while soil P did not change much with soil depth.（2）Soil C∶N mean value of sloping farmland was significantly higher than that of other plots（P〈0.05）,while the surface soil C∶P of sloping farmland was significantly lower than that of other plots（P〈0.05）.Soil C∶N did not change much,while soil C∶P and N∶P showed the trend of decreasing with soil depth.（3）The distribution of soil C,N and P stoichiometry was mainly determined by soil C and N.The correlations of soil C∶P,N∶P and ammonium nitrogen contents,soil clay contents,soil sand contents,soil water-stable aggregates were significant（P〈0.05）.Soil C,N,P contents and their stoichiometry were notonly affected by ecological management and soil depth,but also were relevant to soil physical and chemical proper
作者
李占斌
周波
马田田
柯浩成
徐国策
张祎
于坤霞
成玉婷
LI Zhanbin;ZHOU Bo;MA Tiantian;KE Haocheng;XU Guoce;ZHANG Yi;YU Kunxia;CHENG Yuting(State Key Laboratory Base of Eco hydraulic Engineering in Arid Area, Xi＇an University of Technology, Xi＇an 710048)
出处
《水土保持学报》
CSCD
北大核心
2017年第6期312-318,共7页
Journal of Soil and Water Conservation
基金
国家自然科学基金重点项目“黄土高原生态建设的生态-水文过程响应机理研究”(41330858)
国家自然科学基金项目“基于能量过程的坡沟系统侵蚀产沙过程调控与模拟”(41471226)
陕西省青年科技新星计划项目(2016KJXX-68)
关键词
黄土丘陵区
生态治理
碳氮磷
化学计量比
loess hilly region
ecological management
C, N and P
stoichiometry
