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为了探究不同造林树种对泥质海岸林地土壤微生物生物量、酶活性及养分的影响,以渤海泥质海岸相同立地条件和营林方式的白榆(Ulmus pumila)纯林(UP)、刺槐(Robinia pseudoacacia)纯林(RP)、白蜡(Fraxinus chinensis)纯林(FC)、群众杨(Populus popularis)纯林(PP)为研究对象,对照当地自然生灌草地(CK),研究4种典型防护林林下土壤微生物生物量碳(SMBC)、氮(SMBN)、土壤酶活性及养分的变化。结果表明:在0~10 cm土层内,UP防护林下SMBC、SMBN含量均高于对照灌草地;在10~30 cm土层内,4种防护林SMBC含量均增加。4种防护林均降低了土壤过氧化氢酶与土壤脲酶活性。UP、RP、PP防护林下土壤碱性磷酸酶均显著高于CK,FC显著降低。UP防护林显著增加土壤蔗糖酶活性。4种防护林均显著提高土壤全磷含量,降低土壤pH值。在渤海泥质海岸防护林下,SMBC、SMBN与土壤蔗糖酶、有机碳、全氮、速效磷呈显著正相关,相关系数在0.65~0.83之间。综合分析表明,在渤海泥质海岸带,UP对土壤改良效果最佳,RP、FC、PP防护林改良效果次之。
In order to explore the effects of different afforestation species on soil microbial biomass, enzyme activity and nutrients in muddy coastal forests, Ulmus pumila purebred (UP), Robinia pseudoacacia Pseudoacacia pure plantation, Fraxinus chinensis pure plantation and Populus popularis pure plantation were used to study the effects of four typical shelterbelts Soil microbial biomass carbon (SMBC), nitrogen (SMBN), soil enzyme activities and nutrient contents were analyzed. The results showed that the contents of SMBC and SMBN in UP shelterbelts were all higher than those in control shrub and grassland in 0-10 cm soil layer. The SMBC contents of four shelterbelts increased in 10-30 cm soil layer. Four kinds of shelterbelt decreased soil catalase and soil urease activity. Soil alkaline phosphatase under UP, RP and PP shelterbelts were significantly higher than that of CK and FC significantly decreased. UP shelterbelt significantly increased soil invertase activity. The four kinds of shelterbelts significantly increased soil total P and decreased soil pH. SMBC and SMBN were positively correlated with soil invertase, organic carbon, total nitrogen and available phosphorus in the shelterbelts of the Bohai Sea arbor with the correlation coefficient of 0.65-0.83. Comprehensive analysis shows that in the Bohai Sea muddy coast, UP has the best soil improvement effect, followed by RP, FC and PP shelterbelt.