|吴媛媛1,3; 杨明义1,2; 张风宝1,2; 张加琼1,2; 赵恬茵2
3%、5%、7%）和粒级（＜2 mm、＜1 mm、＜0 . 2 5 mm）的生物炭对坡面片蚀的影响。结果表明：
The Loess Plateau is one of the areas that suffer the most serious soil erosion and the soil in
the area is characterized by low soil fertility and high soil e rodibility. Thanks to its inherent characteristics and
physicochemical properties，biochar has become a novel soil structure amendment. However，so far studies
on biochar have mostly focused on its effects of improving soil physical and chemical properties and plant
growth conditions，reducing greenhouse gas emission and remedying polluted soil，and demonstrated that
its positive effects on soil quality，soil bulk density，soil porosity，quantity and structure of soil aggregate
and soil water dynamics. Little has been reported on its effects on soil resistance to erosion. Getting to know
the effects of biochar on soil erosion will be of great significance not only to soil and water conservancy，butalso to soil building and crop yield. An indoor artificial rainfall experiment was carried out to explore effect of
biochar on sheet erosion on loessal soil slope. The experiment was designed to have one rainfall intensity（90
mm h-1），five application rates（0%，1%，3%，5% and 7%）and three particle sizes（＜2mm，＜1mm
and ＜0.25mm）of biochar of sawdust. Results show that the effect of biochar application on erodibility of
loessal soil plow layers is attributed mainly to its effects altering composition and porosity of the soil and the
effect of its own properties on water，which were embodied in delayed runoff and reduced runoff and sediment
yields and sediment in runoff. Incorporation of biochar，the same in particle size，shortened the duration
of runoff and the effect intensified with rising application rate of biochar. However，when the application
rate was lower than 3%，it delayed runoff，but when the rate went on rising，it affected runoff reversely.
Incorporations of biochar，the same in rate，but different in particle size，did not show much difference
in affecting time of runoff yield. Incorporation of biochar of any size at a rate of 1% demonstrated runoff and
sediment reducing effects in every rainfall event. So，in exploring effects of biochar application rate on runoff
and sediment yields，it is essential to take into account particle size of the biochar. Biochar application rate，
biochar particle size，interaction of the two elements and other uncontrollable factors were responsible for
21.35%，7.27%，41.19% and 30.20%，respectively，of the variation of runoff yield brought about by rainfall
and for 32.9%，8.66%，35.21% and 23.23%，respectively，of the variation of sediment content in runoff.
As the biochar particle size does not have much influence on soil erodibility and sediment yield，biochar
application rate，interaction between content and particle size of the biochar，and other uncontrollable
factors，are the factors contributing 37.16%，34.46% and 28.38%，respectively，to variation of soil
erodibility and 32.48%，35.59% and 31.94%，respectively，to variation of erosion. Obviously，biochar
application rate and interaction between content and particle size of the biochar are major factors affecting
rainfall erosion significantly，and particle size of biochar is a minor one. Though this study is a small scale
research on mechanism of biochar affecting soil erosion，the findings in this study may serve as reference of
scientific significance to large -scale researches on effect of biochar on soil erosion in future .
|First Author Affilication||中国科学院水利部水土保持研究所
吴媛媛,杨明义,张风宝,等. 添加生物炭对黄绵土耕层土壤可蚀性的影响[J]. 土壤学报,2016,53(1):81-92.
吴媛媛,et al."添加生物炭对黄绵土耕层土壤可蚀性的影响".土壤学报 53.1(2016):81-92.
|Files in This Item:||
||There are no files associated with this item.
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.