Chin J Plant Ecol ›› 2018, Vol. 42 ›› Issue (10): 1022-1032.doi: 10.17521/cjpe.2018.0121

• Research Articles • Previous Articles     Next Articles

Effects of desertification on the C:N:P stoichiometry of soil, microbes, and extracellular enzymes in a desert grassland

WU Xiu-Zhi1,YAN Xin1,WANG Bo2,LIU Ren-Tao1,AN Hui1,*()   

  1. 1 Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China / Ministry of Education Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China, Ningxia University, Yinchuan 750021, China
    2 Grassland Experiment Station of Yanchi, Yanchi, Ningxia 751506, China
  • Received:2018-05-23 Online:2019-01-30 Published:2018-10-20
  • Contact: Hui AN E-mail:anhui08@163.com
  • Supported by:
    Supported by the Natural Science Foundation of Ningxia Hui Autonomous Region(NZ17004);the National Natural Science Foundation of China(31660168);the Project of First-Class Disciplines of Western China of Ningxia Hui Autonomous Region(NXYLXK2017B06)

Abstract:

Aims In order to discuss the underlying mechanism of desertification effect on the ecological stoichiometry of soil, microbes and extracellular enzymes, we studied the changes of soil, soil microbial and extracellular enzyme C:N:P stoichiometry during the desertification process in the desert grassland in Yanchi County, China.
Methods The “space-for-time” method was used.
Important findings The results demonstrated that: (1) Soil C, N, P contents and soil C:P, N:P significantly decreased, but soil C:N gradually increased with increasing desertification. (2) Soil microbial biomass C (MBC):soil microbial biomass P (MBP), soil microbial biomass N (MBN):MBP and soil β-1,4-glucosidase (BG):β-1,4-N- acetylglucosaminidase (NAG) gradually decreased, soil BG:alkaline phosphatase (AP) and NAG:AP basically showed an increasing trend with increasing desertification. (3) Desertification increased the soil microbial carbon use efficiency (CUEC:N and CUEC:P) gradually, while soil microbial nitrogen use efficiency (NUEN:C) and soil microbial phosphorus use efficiency (PUEP:C) basically decreased. (4) Soil, soil microbial and soil extracellular enzyme C:N stoichiometry (C:N, MBC:MBN, BG:NAG) were significantly negatively correlated with the soil, soil microbial and extracellular enzyme N:P stoichiometry (N:P, MBN:MBP, NAG:AP), the soil and extracellular enzymes C:N (C:N, BG:NAG) were significantly positively correlated with the soil and extracellular enzymes C:P (C:P, BG:AP). Soil N:P was significantly positively correlated with the soil MBN:MBP, but was significantly negatively correlated with the soil NAG:AP. The analysis demonstrated that soil microbial biomass and extracellular enzyme activity changed with soil nutrient during the desertification process in the desert grassland. The covariation relationship between soil nutrient and C:N:P stoichiometry of microbial-extracellular enzyme provides a theoretical basis for understanding the underlying mechanism of C, N, P cycling in the soil-microbial system in desert grasslands.

Key words: desert grassland, desertification, ecoenzymatic stoichiometry, soil microbes, nutrient use efficiency

Fig. 1

Characteristics of soil C、N、P content and C:N:P ecological stoichiometry (mean ± SD) at different stages of desertification. FD, fixed dunes; G, grasslands; MD, mobile dunes SFD, semi-fixed dunes. Different lowercase letters indicate significance differences among stages (p < 0.05)."

Fig. 2

C:N:P ecological stoichiometry of soil microbial biomass and soil extracellular enzymes (mean ± SD) at different stages of desertification. FD, fixed dunes; G, grasslands; MD, mobile dunes SFD, semi-fixed dunes. AP, alkaline phosphatase; BG, β-1,4-glucosidase; NAG, β-1,4-N-acetylglucosaminidase. Different lowercase letters indicate significance differences among stages (p < 0.05)."

Table 1

Characteristics of soil microbial nutrient utilization efficiency at different desertification stages (mean ± SD)"

沙化阶段 Desertification stage CUEC:N CUEC:P NUEN:C PUEP:C
荒漠草地 Grasslands 0.25 ± 0.06a 0.84 ± 0.02a 0.37 ± 0.06a 0.13 ± 0.03a
固定沙地 Fixed dunes 0.26 ± 0.05a 0.85 ± 0.03a 0.40 ± 0.04ab 0.08 ± 0.03a
半固定沙地 Semi-fixed dunes 0.36 ± 0.04ab 0.85 ± 0.02a 0.29 ± 0.05ab 0.10 ± 0.02ab
流动沙地 Mobile dunes 0.52 ± 0.04b 0.90 ± 0.01a 0.23 ± 0.02b 0.01 ± 0.01b

Table 2

Correlation analysis among soil, microbial and extracellular enzyme ecological stoichiometry"

Soil C:N Soil C:P Soil N:P MBC:MBN MBC:MBP MBN:MBP BG:NAG BG:AP NAG:AP
Soil C:N 1 0.760** -0.396* 0.149 -0.118 -0.143 -0.249 -0.194 0.131
Soil C:P 1 0.159 0.100 0.096 0.260 0.230 0.071 -0.207
Soil N:P 1 -0.157 0.435* 0.573** 0.543** 0.217 -0.427**
MBC:MBN 1 -0.038 -0.604** -0.150 -0.185 0.039
MBC:MBP 1 0.570** 0.198 0.149 -0.224
MBN:MBP 1 0.427* 0.203 -0.366*
BG:NAG 1 0.542** -0.706**
BG:AP 1 0.102
NAG:AP 1
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