Characteristics of Soil Carbon Sequestration and Nutrient Adsorption and Regulation of Straw Returning in Inner Mongolia Plain Irrigation Area

doi:10.7668/hbnxb.20193899

Abstract

Abstract:

In order to provide theoretical basis for straw fertilizing high-yield field and improving saline-alkali field in the process of continuous high yield and stable yield of spring corn in Inner Mongolia plain irrigation area.This study set up a positioning test of corn straw returning to the field for 1 to 4 years (HT1—HT4), taking the straw not returning to the field as the control (CK). Soil organic carbon content, total nitrogen content, available nitrogen content, available phosphorus content, cation exchange capacity, pH value and acid-base buffer curve were measured before spring sowing and during harvest. The results showed that, the relative change rates of soil organic carbon content, total nitrogen content, available nitrogen content, available phosphorus content and cation exchange capacity were 1.34%—3.62%, 0.20%—1.51%, -0.11%—0.78%, 0.89%—6.36% and 0.09%—0.41% during harvest period of HT1—HT4 compared with that before spring sowing. The relative change rates of soil organic carbon content, total nitrogen content, available nitrogen content, available phosphorus content and cation exchange capacity were 1.57%, -0.02%, -0.45%, -0.15% and -0.05% in CK harvest period compared with that before spring sowing. Soil pH value of HT2, HT3 and HT4 was significantly lower than that of CK. The buffer capacity of soil to alkali was HT4>HT3>HT2>HT1>CK. In summary, with the increase of straw returning years, soil carbon sequestration capacity, fertilizer retention capacity and buffering performance increase, and the ability to effectively resist drastic changes in soil pH value caused by fertilizer application and other factors was enhanced, soil quality was significantly improved by straw returning to field for fertilizer cultivation and soil improvement measures.

Key words: Straw returning, Soil organic carbon, Soil nutrient adsorption, Soil cation exchange capacity, Soil acid-base buffer curve, Saline-alkali field

YU Bo, LIU Yameng, YANG Zhe, WANG Jiale, WANG Yuyan, GUO Yan, MA Yang, REN Qin, MU Junxiang. Characteristics of Soil Carbon Sequestration and Nutrient Adsorption and Regulation of Straw Returning in Inner Mongolia Plain Irrigation Area[J]. Acta Agriculturae Boreali-Sinica, 2024, 39(1): 120-126. doi: 10.7668/hbnxb.20193899.

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Figures/Tables 9

Fig.1 Effect of straw returning on soil organic carbon content Different uppercase letters represent the significance difference between different periods of the same treatment (P<0.05),different lowercase letters represent the significance difference between different treatments in the same period(P<0.05).The same as Fig.2—5.

Fig.2 Effect of straw returning on soil total nitrogen content

Fig.3 Effect of straw returning on soil available nitrogen content

Fig.4 Effect of straw returning on soil available phosphorus content

Fig.5 Effect of straw returning on soil cation exchange capacity

Fig.6 Effect of straw returning on soil pH value during harvest time Different lowercase letters represent the significance between different treatments (P<0.05).The same as Fig.8.

Fig.7 Effect of straw returning on soil acid-base buffer curve during harvest time

Fig.8 Relative change rate of each index during harvest time compared with before spring sowing

Tab.1 Correlation analysis between soil cation exchange capacity and soil nutrients during harvest time(r value)

处理 Treatment	土壤有机碳含量 Soil organic carbon content	土壤全氮含量 Soil total nitrogen content	土壤有效氮含量 Soil available nitrogen content	土壤有效磷含量 Soil available phosphorus content	样本数 Number of samples
CK	0.08	-0.99^*	-0.57	-0.81	3
HT1	-0.84	-0.09	0.96^*	0.93^*	3
HT2	-0.99^*	0.44	-0.62	-0.99^*	3
HT3	-0.02	0.99^*	0.88	-0.86	3
HT4	0.11	0.15	-0.97^*	0.17	3

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