长期施用磷肥水稻土微生物量磷的季节变化特征与差异

doi:10.3864/j.issn.0578-1752.2020.07.010

Abstract

Abstract: 【Objective】 The seasonal dynamics of microbial biomass phosphorus (MBP) in paddy soils under long-term different fertilization treatments were studied to reveal the relationship between the variation characteristics and soil phosphorus supply. 【Method】 Taking the long-term experimental plot as a platform, four different fertilization treatments, including CK, NK, NP and NPK, were set up to collect 0-20 cm soil layer at tillering stage, booting stage, filling stage and full ripe stage of rice, respectively, and to determine soil total phosphorus (TP), available phosphorus (AP), acid phosphatase (ACP) activity and MBP.【Result】 Compared with CK and NK treatments, NP and NPK treatments significantly increased the contents of TP and AP in soil, with an increase of 88%-118% and 337%-903%, respectively. MBP was significantly affected by fertilization treatment, and was significantly higher in phosphate fertilization treatment than in non-phosphate fertilization treatment, NP and NPK treatments increased 103%-250% in the whole growth period (except tillering stage) compared with CK and NK treatments; seasonal variation of MBP showed a trend of first increasing and then decreasing and reached the highest level in the filling stage of rice in all fertilization treatments. The activity of acid phosphatase in NK treatment was the highest at grain filling stage, 38% higher than that under CK. At the same time, the turnover rate of microbial biomass phosphorus under this treatment was the highest, which could be recycled 1.31 times in the whole growth period. The correlation analysis showed that soil microbial biomass P was positively correlated with soil total P and available P. 【Conclusion】 The variation of microbial biomass phosphorus with different fertilization treatments and rice growth period was obvious, which was closely related to soil phosphorus availability.

Key words: long-term fertilization, phosphorus fertilizer, microbial biomass phosphorus, paddy soil, growth period

Kai LIU,Jia LIU,XiaoFen CHEN,WeiTao LI,ChunYu JIANG,Meng WU,JianBo FAN,ZhongPei LI,Ming LIU. Seasonal Variation and Differences of Microbial Biomass Phosphorus in Paddy Soils Under Long-Term Application of Phosphorus Fertilizer[J].Scientia Agricultura Sinica, 2020, 53(7): 1411-1418.

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来源 Source	因变量 Dependent variable	自由度 DF	F值 F value	P值 P value
施肥处理 Fertilization （F）	土壤全磷TP	3	166	<0.01
	土壤有效磷AP	3	276	<0.01
	酸性磷酸酶ACP	3	5.22	<0.01
	微生物量磷MBP	3	127	<0.01
生育时期 Growth period （G）	土壤全磷TP	3	2.52	0.075
	土壤有效磷AP	3	4.91	<0.01
	酸性磷酸酶ACP	3	7.39	<0.01
	微生物量磷MBP	3	215	<0.01
施肥处理×生育时期 F×G	土壤全磷TP	9	0.715	0.691
	土壤有效磷AP	9	2.19	0.050
	酸性磷酸酶ACP	9	2.57	<0.05
	微生物量磷MBP	9	23.4	<0.01

施肥处理 Treatment	有效磷库 AP pool (kg·hm^-2)	微生物量磷库 MBP pool (kg·hm^-2)	周转率 MBP turnover rate	周转量 MBP turnover (kg·hm^-2)
CK	5.33b	19.50d	0.59	11.63
NK	5.97b	24.54c	1.31	32.25
NP	35.07a	40.80b	1.07	43.94
NPK	31.14a	55.05a	1.28	70.57

Seasonal Variation and Differences of Microbial Biomass Phosphorus in Paddy Soils Under Long-Term Application of Phosphorus Fertilizer

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