坡向和坡位对小流域梯田土壤有机碳、氮变化的影响

ISWC OpenIR > 水保所知识产出(1956---)

	坡向和坡位对小流域梯田土壤有机碳、氮变化的影响
其他题名	Effects of slope aspect and position on soil organic carbon and nitrogen
	南雅芳; 郭胜利; 张彦军; 李俊超; 周小刚; 李泽; 张芳; 邹俊亮
	2012
发表期刊	植物营养与肥料学报
卷号	18 期号:03 页码:595-601
摘要	坡向和坡位是影响土壤有机碳(SOC)和全氮(TN)变化的两大重要地形因素。研究其对小流域梯田SOC和TN变化的影响,对预测黄土高原地区坡改梯条件下土壤碳汇变化具有重要意义。本文以黄土丘陵沟壑区—高泉沟小流域为例,区分东、西两种坡向,再根据海拔区分上(2220～2326 m)、中(2130～2220 m)、下(1938～2130 m)三种坡位,共采集213个土壤样品,研究坡向、坡位对梯田耕层(0～20 cm)SOC和TN的影响。结果表明,西向坡SOC和TN含量分别比东向坡高22.8%和13.6%(P<0.1),东西向坡的中、下坡位SOC和TN含量均大于上坡位。在西向坡,SOC含量下坡位(8.78 g/kg)最高,中坡位(7.82 g/kg)次之,上坡位(7.46 g/kg)最低;与上坡位相比,中坡位和下坡位的TN含量提高了12.1%,24.2%。在东向坡,SOC含量中坡位(7.15 g/kg)最高,下坡位(6.28 g/kg)次之,上坡位(5.37 g/kg)最低;与上坡位相比,中坡位和下坡位的TN含量提高了37.3%和29.4%。坡向与坡位的交互作用对流域SOC的空间分布影响显著
其他摘要	Slope aspect and position are two important factors which affect the changes of soil organic carbon ( SOC) and total nitrogen ( TN) ． It is important for studying the influences of two terrain factors on the SOC and TN and forecasting the changes of carbon sink in watersheds of the Loess Plateau． Based on two slope aspects ( west-facing slope and east-facing slope) and three slope positions ( upper slope，mid slope and lower slope) ，213 soil surface samples were collected to investigate effect of slope aspects and positions on SOC and TN ( 0－20 cm) in terraces at a typical watershed of Gaoquangou in hilly regions of the Loess Plateau． SOC and TN in the 0－20 cm soil layer on the west-facing slopes are improved by 22. 8% and 13. 6% compared with those of the east-facing slopes ( P ＜ 0. 1) ． In the same slope aspect or slope positions，SOC and TN in the 0－20 cm soil layer in the mid slopes and lower slopes are higher than those of the upper slopes． In the west-facing slopes，the contents of SOC in the lower slopes ( 8. 78 g /kg) are the highest，followed by the mid slopes ( 7. 82 g /kg) ，and the contents of SOC in the upper slopes ( 7. 46 g /kg) are the lowest． Compared with the upper slopes，the contents of TN are increased by 12. 1% in the mid slopes ( P ＞ 0. 1) and increased by 24. 2% in the lower slopes ( P ＜ 0. 1) ． In the east-facing slopes，the contents of SOC in the mid slopes ( 7. 15 g /kg) are the highest，followed by the lower slopes ( 6. 28 g /kg) ，and the contents of SOC in the upper slopes ( 5. 37 g /kg) are the lowest． Compared with the upper slopes， the contents of TN are increased by 37. 3% in the mid slopes ( P ＜ 0. 1) and increased by 29. 4% in the lower slopes ( P ＜ 0. 1) ． The interaction of slope aspect and position affects spatial distribution of SOC in the watershed significantly ( P ＜ 0. 1) ． Slope aspect and position have significant influences on soil C /N ratio ( P ＜ 0. 1) ． These results are useful for accurately estimating the changes of SOC and TN in terraces of the small watersheds．
关键词	坡向坡位梯田土壤有机碳全氮 Slope Aspect Slope Position Terrace Soil Organic Carbon Total Nitrogen
语种	中文
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/5331
专题	水保所知识产出(1956---)
推荐引用方式 GB/T 7714	南雅芳,郭胜利,张彦军,等. 坡向和坡位对小流域梯田土壤有机碳、氮变化的影响[J]. 植物营养与肥料学报,2012,18(03):595-601.
APA	南雅芳.,郭胜利.,张彦军.,李俊超.,周小刚.,...&邹俊亮.(2012).坡向和坡位对小流域梯田土壤有机碳、氮变化的影响.植物营养与肥料学报,18(03),595-601.
MLA	南雅芳,et al."坡向和坡位对小流域梯田土壤有机碳、氮变化的影响".植物营养与肥料学报 18.03(2012):595-601.

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