螃蟹对闽江河口湿地土壤碳氮磷含量及其生态化学计量学特征影响

为阐明螃蟹活动对湿地土壤碳、氮、磷含量及其生态化学计量学特征的影响,对闽江河口湿地不同潮滩螃蟹干扰下的土壤碳、氮、磷含量及其生态化学计量学特征进行了测定和分析.结果表明:高潮滩有螃蟹(GP)和高潮滩无螃蟹(GD)组土壤碳、氮、磷含量的平均值分别为(13.32±0.66)、(1.51±0.05)、(0.70±0.05)g·kg~(-1)和(13.25±0.53)、(1.52±0.04)、(0.75±0.04)g·kg~(-1),螃蟹组与对照组之间的碳、氮、磷含量差异不显著(p0.05);中潮滩有螃蟹(ZP)和中潮滩无螃蟹(ZD)组土壤碳、氮、磷含量的平均值分别为(13.85±0.61)、(1.64±0.08)、(0.77±0.07)g·kg~(-1)和(13.10±0.43)、(1.52±0.08)、(0.79±0.04)g·kg~(-1),螃蟹组土壤碳、氮含量显著高于对照组(p0.05),但磷含量差异不显著(p0.05).GP和GD组土壤C/N、C/P、N/P的平均值分别为(8.80±0.26)、(19.38±1.34)、(2.17±0.16)和(8.70±0.28)、(17.78±0.42)、(2.04±0.13),螃蟹组养分比与对照组差异不显著(p0.05);ZP和ZD组土壤C/N、C/P、N/P的平均值分别为(8.57±0.27)、(18.41±0.68)、(2.11±0.18)和(8.52±0.35)、(16.72±0.32)、(2.01±0.19),螃蟹组养分比与对照组差异不显著(p0.05).总体来看,土壤碳、氮、磷及其生态化学计量学特征的变化是环境因子综合作用的结果,其生态化学计量学特征对土壤碳、氮、磷固持及限制性养分具有一定的指示作用.

Effects of crabs on soil carbon, nitrogen, phosphorus concentration and ecological stoichiometry in Minjiang River estuarine wetlands

In order to clarify the effects of crabs activities on soil carbon, nitrogen, and phosphorus concentration and its ecological stoichiometry characteristics, the soil carbon, nitrogen, and phosphorus concentration and its ecological stoichiometry characteristics under effects of crabs activities in different flat of Minjiang River estuarine wetlands were measured and analyzed. The results showed:the averaged soil carbon, nitrogen and phosphorus concentration were (13.32±0.66), (1.51±0.05), (0.70±0.05) g·kg^-1 and (13.25±0.53), (1.52±0.04), (0.75±0.04) g·kg^-1 in the GP (high tide flat with crabs) and GD (high tide flat without crab) groups, respectively, and the soil carbon, nitrogen and phosphorus concentrations were not significantly different between the crab group and the control group (p>0.05). The averaged soil carbon, nitrogen and phosphorus concentration were (13.85±0.61), (1.64±0.08), (0.77±0.07) g·kg^-1 and (13.10±0.43), (1.52±0.08), (0.79±0.04) g·kg^-1 in the ZP (in the tidal flat with crabs) and ZD (in the tidal flat without crabs) groups, and the soil carbon and nitrogen concentration of the crab group was significantly higher than that in control group (p<0.05), but the phosphorus concentration was not significantly different(p>0.05). The averaged values of C/N,C/P and N/P were (8.80±0.26), (19.38±1.34), (2.17±0.16) and (8.70±0.28), (17.78±0.42), (2.04±0.13) in the soils of GP and GD, respectively, and the nutrient ratios were not significantly different between the crab group and the control group (p>0.05). The averaged values of C/N,C/P and N/P were (8.57±0.27), (18.41±0.68), (2.11±0.18) and (8.52±0.35), (16.72±0.32), (2.01±0.19) in the soils of ZP and ZD, and the nutrient ratios were not significantly different between the crab group and the control group (p>0.05). In general, the changes of soil carbon, nitrogen, phosphorus and its ecological stoichiometry characteristics were controlled by the combined effect of environmental factors. The ecological stoichiometry characteristics had indication on soil carbon, nitrogen and phosphorus sequestration and limited nutrient.