z-logo
Premium
Changes in soil organic carbon fractions in response to wheat straw incorporation in a subtropical paddy field in China
Author(s) -
Dai Wei,
Gao Hui,
Sha Zhimin,
Penttinen Petri,
Fang Kaikai,
Wang Jun,
Cao Linkui
Publication year - 2021
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.202000200
Subject(s) - straw , soil carbon , total organic carbon , chemistry , agronomy , rice straw , biomass (ecology) , field experiment , soil water , particulate organic carbon , zoology , environmental science , environmental chemistry , nutrient , soil science , inorganic chemistry , biology , phytoplankton , organic chemistry
Background : Optimal wheat straw management in paddy fields is important for evaluating soil organic carbon (SOC) dynamics and sustaining soil quality. Aims : We investigated the effects of wheat straw incorporation in paddy soil on the total SOC content, soil labile organic C fractions [water soluble organic C (WSOC), hot‐water soluble organic C (HWSOC), easily oxidizable C (EOC), microbial biomass C (MBC), particulate organic C (POC), and light fraction organic C (LFOC)], and C pool management index (CPMI). Methods : Rice (var. Qingjiao 307) was grown from June to November 2019 in a subtropical paddy field, under four different treatments: without any amendments (control; CK); with N, P, and K fertilizers (NPK); with NPK and a moderate rate of wheat straw application (NPKS1); and with NPK and a high rate of wheat straw application (NPKS2). Soil samples were collected from depths of 0–5, 5–10, 10–20, and 20–30 cm after the rice was harvested. Results : In all soil layers, the bulk density was 10.79–51.85% lower and the total SOC, WSOC, HWSOC, EOC, MBC, POC, and LFOC contents were 13.87–145.97% higher in the NPKS2 treatment than in the CK treatment ( p < 0.05). The CPMI was highest in the NPKS2 treatment in the top 20 cm soil. SOC correlated positively with labile C fractions and CPMI in the 0–5 and 5–10 cm soil layers ( p < 0.05), with the exception of WSOC and LFOC in the 5–10 cm soil layer. The sensitivity of each soil labile organic C fraction to the different treatments varied in the 0–5 cm soil layer. Rice yield was highest in the NPKS2 treatment. Conclusions : Overall, the NPKS2 treatment had a positive effect on SOC stocks and higher soil quality in subtropical paddy soils in China.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here