不同气候与施肥条件下农田土壤微生物生物量特征与容量分析

doi:10.3864/j.issn.0578-1752.2017.06.008

Abstract

Abstract: 【Objective】Soil microbial biomass is an important index of soil biological fertility and also is an important pool of soil nutrient turnover. The objective of this study was to explore the capacity and characteristics of soil microbial biomass carbon (SMBC) and nitrogen (SMBN) under various climatic zones and fertilization managements across China cropland, and further to obtain better understanding of the factors and how to manage soil biological fertility.【Method】The publications were collected by searching Web of China Knowledge Resource Integrated Database, Wan Fang Database and Web of Science with the keywords of "soil microbial biomass", "Chinese cropland" and "long-term fertilization". A data set with 458 pairs of reported soil organic carbon (SOC) and SMBC and 414 pairs of reported total nitrogen (TN) and SMBN was set up from 42 published papers. They included such four categories of climatic zone as typical temperate (M1: humid; M2: semi-arid), warm-temperate (W) and subtropical (S) zones and two categories of fertilization with (+OM) and without (-OM) organic amendments across China. Statistical analysis on the median of SMBC/SOC and SMBN/TN under different fertilization managements and climate zones was performed with Kruskal-Wallis H test (P<0.05). The capacity of SMBC and SMBN to SOC and TN was obtained from boundary line, respectively.【Result】Results showed that there was a significant response of soil microbial biomass (SMBC and SMBN) to the increase in SOC and TN under different fertilization managements and climate zones (P<0.01), respectively. The response coefficients (i.e., the correlation slope) between SMBC and SOC, SMBN and TN were 24.77 and 30.27 under organic amendments, respectively, which were significantly higher than that under the management without organic amendments (19.88 for SMBC and 19.86 for SMBN) (P<0.05). Boundary analysis showed that the maximum response coefficients of SMBC to SOC and SMBN to TN were 33.45-36.00 and 45.45-49.79, respectively. Compared with the maximum values, the current average values still have 37.99% and 49.66% of room for improvement, respectively. The median values of SMBC/SOC and SMBN/TN were significantly different among the four climate zones. The highest value of SMBC/SOC was 2.73% under temperate semi-arid and sub-humid zone (M2), followed by sub-tropical (S, 2.45%) and warm humid zone (W, 2.31%), the lowest value is 1.48% under temperate humid zone (M1). The sequence of SMBN/TN was W (4.72%) >M2 (3.50%) >S (2.99%) >M1 (1.80%). The ranges of SMBC/SOC and SMBN/TN were 0.35%-6.50% and 0.50%-9.72%, respectively, under various fertilization conditions with no significant differences. For different fertilization managements under similar climatic zone, the median value of SMBC/SOC and SMBN/TN was significantly higher under organic fertilizer management than that under no organic fertilizer management under temperate humid zone (P<0.05).【Conclusion】Climatic conditions have a significant impact on soil microbial biomass capacity. Different fertilization managements do not significantly change the SMBC/SOC and SMBN/TN, but the organic amendment can significantly improve SMBC and SMBN, which are helpful for soil biological fertility improvement.

Key words: China cropland, fertilization management, climate zone, SMBC/SOC, soil microbial biomass carbon, soil microbial biomass nitrogen

WANG ChuanJie, XIAO Jing, CAI AnDong, ZHANG WenJu, XU MingGang. Capacity and Characteristics of Soil Microbial Biomass Under Various Climate and Fertilization Conditions Across China Croplands[J].Scientia Agricultura Sinica, 2017, 50(6): 1067-1075.

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