收藏本站
收藏 | 手机打开
二维码
手机客户端打开本文

Effect of Slope,Rainfall Intensity and Mulch on Soil Erosion and Nutrients Contents of the Purple Soil in South-western Sichuan Province,China

Muhammad Naeem Khan  
【摘要】:Soil erosion and resultant loss of surface soil fertility are major threats in reducing the potential of crop production in Purple soil of south western Sichuan province of China.Nutrients mass losses are controlled by their pools in the soil surface layer which is exposed to water erosion and the effects of rainfall intensity and slope on this pool are seldom studied.Therefore,various rainfall simulated experiments were conducted to evaluate the effect of rainfall intensities(33 mm h-1,54 mm h-1,94 mm h-1 and 120 mm h-1)and(5° 15°and 25°)slopes on sediment and water losses,infiltration rate and water recharge coefficient(RC)in un-mulched and mulched soil trays.After rainfall simulations,soil surface layer of 10 mm thickness from each tray was removed and variations in soil particle sizes distributions and soil organic carbon(SOC),total nitrogen(TN),available nitrogen(AN),total phosphorus(TP),available phosphorus(AP)and total potassium(TK)contents in response to different rainfall intestines and slopes were investigated.Sediment and water losses increased with rainfall intensity and slope steepness under mulched and un-mulched conditions.The maximum sediment and surface runoff losses of 876.2 gm-2 and 681 mm·m-2 were recorded in un-mulched soil during rainfall intensities of 94 mm·h-1 and 120 mm·h-1 at the 25° slope.Generally,the slope contribution(Sc)on water and sediment losses decreased with increasing rainfall intensity and slope steepness.In un-mulched conditions,water losses were independent of slope steepness during the highest rainfall intensity.However,in mulched soil,higher contributions of slope(Sc)and rainfall(Rc)were found for water runoff and sediment losses(50%),except during the increase in slope steepness from 15° to 25° under the highest rainfall intensity(120 mm·h-1).The effectiveness of mulch was more pronounced in reducing sediment losses(81%-100%)compared with water losses(14%-100%).The conservation effectiveness of mulch decreased and increased with slope steepness for water and sediment losses under higher rainfall intensities.Water infiltration and recharge coefficient(RC)decreased with increased slope steepness.Moreover,with increase in rainfall intensity,the water infiltration increased while the RC decreased in both mulched and un-mulched soil.In un-mulched soil,clay contents(0-2μm)decreased significantly(p0.05)with slope steepness during lower rainfall intensities(33mm h-1,54mm·h-1).However,during higher rainfall intensities clay(0-2μm),fine silt(2-20μm)and coarse silt(20-50μm)tended to increase while the sand contents decreased significantly(p0.05)at higher(15° and 25°)slopes compared with 5° slope.In the mulched soil,clay(0-2μm)and coarse silt(20-50μm)contents decreased significantly at 5° slopes compared with steeper slopes only under rainfall simulations of 94 mm h-1 and 120 mm h-1,respectively.Rainfall intensity had negatively correlated with clay and fine silt contents while mulch had significantly correlation with fine silt.Average SOC,total N and available N contents significantly decreased with increase in slope and rainfall intensity in unmulched soil whilst they were only decreased with increase in rainfall intensity in mulched soil.However,there were non-significant differences in the TK contents under the different rainfall intensities and slopes both in mulched and un-mulched conditions.The average contents of total and available P decrease significantly in the surface soil at the 5°slope compared with higher slopes under all conditions.Moreover,like SOC and N,P(total and available)contents significantly reduced with increasing rainfall intensity.After rainfall simulations,clay and silt size particles were substantially reduced while sand contents increased in top surface layer of 10 mm thickness compared with pre-simulated soil both in mulched and un-mulched conditions.Soil fine particles and nutrients pool in soil surface layer decreased in all conditions compared with their respective contents in pre-simulated soil.However,mulch maintained significant higher fine silt contents and SOC,TN,TP and TK contents compared with unmulched soilResults suggests that;1)mulching the soil surface is one of the best management practices for reducing soil erosion and maintaining soil fertility,2)mulching effectively promoted water infiltration and water recharge coefficient,3)mulched soil maintained a significantly higher nutrient pools compared to that of the un-mulched and,4)both lower slopes,and rainfall intensities,and mulch facilitate the transport of soil fine material and nutrients into lower soil layers and nutrients losses could be reduced in succeeding rainfall events.


知网文化
【相似文献】
中国期刊全文数据库 前20条
1 XinPing Wang;YaFeng Zhang;RuiHu;YanXia Pan;HaoJie Xu;Wei Shi;YanXia Jin;Hiroshi Yasuda;;Revisit of event-based rainfall characteristics at Shapotou area in northern China[J];Sciences in Cold and Arid Regions;2016年06期
2 HAN Yong;ZHENG Fen-li;XU Xi-meng;;Effects of rainfall regime and its character indices on soil loss at loessial hillslope with ephemeral gully[J];Journal of Mountain Science;2017年03期
3 YUE Xiangfei;ZHANG Tonghui;ZHAO Xueyong;LIU Xinping;MA Yunhua;;Effects of rainfall patterns on annual plants in Horqin Sandy Land, Inner Mongolia of China[J];Journal of Arid Land;2016年03期
4 ;A method to quantitatively estimate rainfall rate above water surface based on different spectra shapes generated by rainfall[J];Chinese Journal of Acoustics;2011年03期
5 ;Variation Characteristics of Longest Continuous Rainfall Days in Shenyang in Recent 48 Years[J];Meteorological and Environmental Research;2011年02期
6 ;Analysis of stability for Taizishang slope under condition of atomization rainfall of jet overflows[J];Global Geology;2011年04期
7 孙照渤;章基嘉;T.N.Palmer;;THE CORRELATIONS BETWEEN SST AND SUMMER PRECIPITATION OVER EASTERN CHINA AND THE EFFECT OF THE SST ANOMALY IN THE SOUTH CHINA SEA ON THE SUMMER MONSOON AND PRECIPITATION[J];Acta Meteorologica Sinica;1988年04期
8 余志豪;陆汉城;范献忠;;AN OBSERVATIONAL STUDY OF THE MESO-β SCALE MOVING SYSTEMS IN THE MEIYU FRONT[J];Acta Meteorologica Sinica;1988年04期
9 C.A.Madramootoo,G.L.Austin,M.Blaskovic;Statistical Analyses of Runoff,River Stage and Peak Discharge,Tao River,China[J];高原气象;1989年01期
10 S.T.CHAN;YIWU HUANG;;CAN THE EXTREME RAINFALL ASSOCIATED WITH TYPHOON MORAKOT (2009) HAPPEN IN HONG KONG?[J];Tropical Cyclone Research and Review;2012年01期
11 S.BALACHANDRAN;B.GEETHA;K.RAMESH;N.SELVAM;;TCRAIN–A DATABASE OF TROPICAL CYCLONE RAINFALL PRODUCTS FOR NORTH INDIAN OCEAN[J];Tropical Cyclone Research and Review;2014年02期
12 Yan-wei Sun;Christine Pomeroy;Qing-yun Li;Cun-dong Xu;;Impacts of rainfall and catchment characteristics on bioretention cell performance[J];Water Science and Engineering;2019年02期
13 Sananda Kundu;Deepak Khare;Arun Mondal;;Future changes in rainfall,temperature and reference evapotranspiration in the central India by least square support vector machine[J];Geoscience Frontiers;2017年03期
14 ;Inter-decadal variations of springtime rainfall over southern China mainland for 1979-2004 and its relationship with Eurasian snow[J];Science China(Earth Sciences);2012年02期
15 ;Wavelet analysis of rainfall variation in the Hebei Plain[J];Science in China(Series D:Earth Sciences);2005年12期
16 林毅,刘爱鸣,林新彬;A COMPREHENSIVE ANALYSIS OF INTERACTIONS BETWEEN MESO-SCALE CONVECTIVE CLOUD CLUSTERS IN TYPHOONS AND MESOSCALE HEAVY RAINS[J];Journal of Tropical Meteorology;2003年01期
17 ;The influence of the surface heat fluxes of the Kuroshio key-area on meiyu rainfall in the Changjiang River region[J];Acta Oceanologica Sinica;1991年01期
18 LIU Rentao;ZHU Fan;Yosef STEINBERGER;;Ground-active arthropod responses to rainfall-induced dune microhabitats in a desertified steppe ecosystem,China[J];Journal of Arid Land;2016年04期
19 WU XiangHua;NIU ShengJie;JIN DeZhen;SUN HaiYan;;Influence of natural rainfall variability on the evaluation of artificial precipitation enhancement[J];Science China(Earth Sciences);2015年06期
20 SHEN Xin-Yong;QING Tao;HUANG Wen-Yan;LI Xiao-Fan;;Effects of Vertical Wind Shear on the Pre-Summer Heavy Rainfall Budget:A Cloud-Resolving Modeling Study[J];Atmospheric and Oceanic Science Letters;2013年01期
中国重要会议论文全文数据库 前10条
1 Dongkyun Kim;;Development Of Future Rainfall Scenario Generator[A];中国水利学会2016学术年会论文集(下册)[C];2016年
2 Xuebing Mei;Qian Sui;Shuguang Lu;Dan Wang;Zhaofu Qiu;;Influence of rainfall on the occurrence of PPCPs in Huangpu River, Shanghai[A];持久性有机污染物论坛2017暨第十二届持久性有机污染物学术研讨会论文集[C];2017年
3 ;Initialization with rainfall derived diabatic heating[A];全国优秀青年气象科技工作者学术研讨会论文集[C];2006年
4 贾小龙;陈丽娟;任福民;李崇银;;Impacts of the Madden-Julian Oscillation on Winter rainfall and Circulation in China[A];第七届全国优秀青年气象科技工作者学术研讨会论文集[C];2010年
5 ;El Nino-Southern Oscillation-related principal interannual variability modes of early and late summer rainfall over East Asia in sea surface temperature-driven atmospheric general circulation model simulations[A];2012北京气象学会中青年优秀论文评选论文集[C];2012年
6 ;Role of surface evaporation in surface rainfall processes[A];第七届全国优秀青年气象科技工作者学术研讨会论文集[C];2010年
7 ;Role of surface evaporation in surface rainfall processes[A];“2010年北京气象学会中青年优秀论文评选”学术研讨会论文集[C];2011年
8 P.Klongvessa;M.Lu;S.Chotpantarat;;Variation of Critical Rainfall Duration upon Its Magnitude in Middle and Lower Yom Basin,Thailand[A];2017年武汉博生学术交流有限公司论文汇编集[C];2017年
9 GUO Li;ZHU Cong-Wen;LIU Bo-Qi;MA Shuang-Mei;;Subseasonal variation of winter rainfall anomalies over South China during the mature phase of super El Ni?o events[A];第35届中国气象学会年会 S25 研究生论坛[C];2018年
10 ;Characteristics of Soil and Water Losses on Different Land Uses in Low and Deep Hills of North Sichuan,China[A];Proceedings of Symposium from Cross-strait Environment & Resources and 2nd Representative Conference of Chinese Environmental Resources & Ecological Conservation Society[C];2010年
中国博士学位论文全文数据库 前1条
1 Muhammad Naeem Khan;[D];四川农业大学;2016年
中国硕士学位论文全文数据库 前1条
1 阮玄晨(NGUYEN XUAN TUNG);越南林同省多怀县的山洪风险分析研究[D];武汉大学;2017年
中国知网广告投放
 快捷付款方式  订购知网充值卡  订购热线  帮助中心
  • 400-819-9993
  • 010-62982499
  • 010-62783978