Scientia Agricultura Sinica ›› 2020, Vol. 53 ›› Issue (7): 1411-1418.doi: 10.3864/j.issn.0578-1752.2020.07.010

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

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

Kai LIU1,2,Jia LIU3,XiaoFen CHEN3,WeiTao LI1,ChunYu JIANG1,2,Meng WU1,2,JianBo FAN1,ZhongPei LI1,2,Ming LIU1,2   

  1. 1. Institute of Soil Science, Chinese Academy of Sciences/State Key Laboratory of Soil and Sustainable Agriculture, Nanjing 210008
    2. University of Chinese Academy of Sciences, Beijing 100049
    3. Soil and Fertilizer & Resources and Environment Institute, Jiangxi Academy of Agricultural Sciences/ National Engineering & Technology Research Center for Red Soil Improvement, Nanchang 330200
  • Received:2019-06-13 Accepted:2019-08-22 Online:2020-04-01 Published:2020-04-14

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

Table 1

Inter-subject effect test of soil total phosphorus, available phosphorus, acid phosphatase and microbial biomass phosphorus in different fertilization treatments and growth periods"

来源
Source
因变量
Dependent variable
自由度
DF
F
F value
P
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

Fig. 1

Changes of total phosphorus (a) and available phosphorus (b) in the soils in different growth periods of rice under different long-term fertilization treatments In the figure, same letter means no significant difference, and different letter means significant difference, P=0.05. The same as below"

Fig. 2

Changes of microbial biomass phosphorus (a) and acid phosphatase activity (b) in the soils in different growth periods of rice under different long-term fertilization treatments"

Table 2

Turnover of soil microbial biomass phosphorus under different fertilization treatments"

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
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