水土保持学报2024，Vol.38Issue(4)：20-28,9.DOI:10.13870/j.cnki.stbcxb.2024.04.007
东北黑土坡耕地土壤化学计量特征变化对侵蚀的响应
Response of Soil Stoichiometric to Soil Erosion on Slope Farmland in Black Soil Region of Northeast China
摘要
Abstract
[Objective]The impact of soil erosion on nutrient content and stoichiometric ratios in soil is crucial for further comprehending and effective control of quality degradation in the sloping farmlands of black soil regions.[Methods]Selecting straight slopes cultivated for over a century and a convex slope cultivated for more than five decades in the typical black soil area of Keshan County as the research objects,utilizing 137Cs tracing method to estimate soil erosion rates on the slopes.Quantitative analysis was conducted on the relationship between soil erosion and key parameters such as soil organic carbon(SOC),total nitrogen(TN),and total phosphorus(TP)contents,along with the stoichiometric ratio in the ecological chemistry.[Results](1)Using 137Cs tracing technique,the average annual erosion rate of the whole slope was 4 428.56 t/(km2·a),the average erosion rates of the linear and convex slopes were 3 284.53,5 884.59 t/(km2·a),and the total erosion volumes were calculated at 3.21 × 105,2.94 × 105 t/km2,respectively.(2)The overall carbon/nitrogen ratio(C/N)on the slopes showed a highly significant positive correlation with SOC(p＜0.01),and the carbon/phosphorus ratio(C/P)correlated positively and significantly with SOC(p＜0.01).Conversely,the nitrogen/phosphorus ratio(N/P)demonstrated a highly significant negative correlation with TP(p＜0.01).On linear slopes,SOC,TN,C/N,C/P and N/P were significantly lower than those on convex slopes(p＜0.01),while TP content was higher than that on convex slopes(p＜0.01).(3)The spatial distribution characteristics of soil erosion on the slopes align with the distribution of SOC,TN and TP.The amount of soil erosion on the slopes exhibited a highly significant negative correlation with SOC,TN,TP and C/P(p＜0.01),and a significant negative correlation with C/N(p＜0.05).The correlation with N/P is negative,though not statistically significant(p＞0.05).[Conclusion]Ultimately,soil erosion redistributed SOC,TN and TP on the slopes,affecting the stoichiometric ratios of soil nutrients and leading to substantial nutrient loss on the slopes.关键词
土壤侵蚀/137Cs/土壤养分/化学计量特征/黑土/坡耕地Key words
soil erosion/137Cs/soil nutrients/stoichiometric characteristics/black soil/sloping arable land分类
农业科技引用本文复制引用
康晓祺,何彦星,张风宝,杨明义..东北黑土坡耕地土壤化学计量特征变化对侵蚀的响应[J].水土保持学报,2024,38(4):20-28,9.基金项目
国家自然科学基金项目(42177340,41877080) （42177340,41877080）
国家重点研发计划项目(2018YFC0507001) （2018YFC0507001）
