CAJ | 학술논문

以黄河三角洲潮上带湿地为对象,通过采样、分析,研究了4种典型的植被群落下水盐梯度和土壤养分含量的变化特征.结果显示,沿植物群落演替方向,土壤水分含量无显著差异,土壤盐分呈逐渐降低的趋势,在一定程度上反映了植物群落的不同演替阶段.在这种水盐梯度下,植被群落的变化能够影响土壤养分含量,沿着植被演替方向,全碳与有机质含量随着演替方向呈先逐渐降低后增加的趋势,土壤碳氮比((C/N)在植被演替中期相对较高;全氮含量沿着演替方向呈现增加趋势,硝态氮与铵态氮先增加后降低;全磷与有效磷随演替变化系数较小,演替中期各理化性质变异系数相对较大.各群落土壤C/N值均小于25.相关分析表明,全氮、有机质与有效磷两两显著相关(p<0.01),有效磷还与含水率显著相关(p<0.05),硝态氮、钱态氮和全磷未显示出与其他理化性质的相关关系.含水率与pH值显著相关(p<0.05),且二者均与土壤盐分显著负相关(p<0.01).
이황하삼각주조상대습지위대상,통과채양、분석,연구료4충전형적식피군락하수염제도화토양양분함량적변화특정.결과현시,연식물군락연체방향,토양수분함량무현저차이,토양염분정축점강저적추세,재일정정도상반영료식물군락적불동연체계단.재저충수염제도하,식피군락적변화능구영향토양양분함량,연착식피연체방향,전탄여유궤질함량수착연체방향정선축점강저후증가적추세,토양탄담비((C/N)재식피연체중기상대교고;전담함량연착연체방향정현증가추세,초태담여안태담선증가후강저;전린여유효린수연체변화계수교소,연체중기각이화성질변이계수상대교대.각군락토양C/N치균소우25.상관분석표명,전담、유궤질여유효린량량현저상관(p<0.01),유효린환여함수솔현저상관(p<0.05),초태담、전태담화전린미현시출여기타이화성질적상관관계.함수솔여pH치현저상관(p<0.05),차이자균여토양염분현저부상관(p<0.01).
Soil nutrient contents were measured in 31 study plots of the supratidal zone wetland of Yellow River Delta( YRD) in order to reveal their changes in marsh soils with different plant communities. By the methods of spatial distribution as a substitute for time succession, differ-ent plant communities were chosen to substitute different periods of plant community succession. Results showed that there were obvious rela-tionships among four plant communities and soil salt contents (SC ) but there were no significant differences among water contents ( WC), which also showed different succession periods of plant community to some certain. Along the positive succession direction of pant communi-ty, both the contents of soil organic matter( SOM) and their variation coefficients showed the trend of "decreasing before increasing" along the water-salt gradients. The ratios of C/N were relatively higher in the middle of the successions than at the beginning or later stage. Total nitro-gen(TN) contents showed an increase while NH~+_4-N and NO~-_3-N showed the trends of "decreasing after increasing". Total phosphorus (TP) contents had no significant variations with the succession. No significant differences were observed in total phosphorus(TP ) and available phosphorus(AP) contents of wetland soils under four plant communities. The middle of the succession had the higher variation coefficients. In wetland soils under four plant communities, the ratios of C/N were all lower than 25. Correlation analysis showed that there were significantly positive correlations between TN、SOM and AP(P<0.01). TP was significantly positively correlated with WC(P<0.05). No significant correla-tions were found between NH~+_4-N、NO~-_3-N and TP with other soil properties. WC were significantly positively correlated with pH(P<0.05) and both of them were negatively correlated with SC(P<0.01).