ZHANG Yueqi, SUN Xue, ZHANG Guoxian, et al. Soil Aggregation and Total Carbon Distribution in Soil Amended with Straw and Lime of Greenhouse[J]. 2018, 32(3): 199-204.
DOI:
ZHANG Yueqi, SUN Xue, ZHANG Guoxian, et al. Soil Aggregation and Total Carbon Distribution in Soil Amended with Straw and Lime of Greenhouse[J]. 2018, 32(3): 199-204. DOI: 10.13870/j.cnki.stbcxb.2018.03.031.
Soil Aggregation and Total Carbon Distribution in Soil Amended with Straw and Lime of Greenhouse
The stability of soil aggregates provide physical protection for soil carbon
while soil carbon promotes the formation of soil aggregates. To evaluate the effects of long-term straw and quicklime application on soil aggregates stability and total carbon (TC) accumulation at aggregate
soils from plots amended with M (chicken manure)
MR (chicken manure + straw)
MCa (chicken manure + quicklime)
MRCa (chicken manure + straw + quicklime) were collected compared with CK (no-fertilizer). Soil was separated into five size fractions (5~2
2~1
1~0.5
0.5~0.25
< 0.25 mm) by wet-sieving. The results showed as follows:(1) Straw return or liming increased the distribution of > 0.25 mm size fractions
MR and MCa caused 123% and 37% increase relative to the M
respectively; while application of straw and quicklime together had a significant effect on the distribution of 5~2 mm size fraction
compared with MR
MCa and M
the MRCa caused 12%
59% and 141% increase
respectively. (2) Application of straw and quicklime could increase the MWD
GMD and R0.25. MR treatment had the highest MWD
GMD and R0.25
followed by the MRCa treatment
MR and MRCa were significantly higher than those of MCa
M and CK. (3) Addition of straw and quicklime could increase the TC content
compared with MR
MCa and M
MRCa caused 20%
40% and 55% increase
respectively; straw return and liming significantly increased the TC content of 5~2 mm size fraction; liming could increase the TC content of 0.5~0.25 mm size fraction; both straw and lime could significantly increase the contribution of TC in the >0.25 mm size fractions to the bulk soil TC. (4) TC content was positively correlated with the distribution of 5~2
2~1
1~0.5 mm size fractions
and negatively correlated with the distribution of < 0.25 mm size fraction. MWD
GMD and R0.25 were positively correlated with the distribution of > 0.25 mm size fractions
and negatively correlated with the distribution of < 0.25 mm size fraction. Therefore
straw return and liming could improve the soil structure and carbon level. These findings were beneficial to alleviate the problem of soil structural fission caused by long-term continuous cropping in the agricultural production of greenhouse.
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