摘要
研究海岸带沙地防护林土壤碳氮磷含量及其计量学特征,可为评估防护林对土壤养分和碳汇功能的改善提供理论依据。以海南岛海岸带沿岸12个市(县)的24处沙地(林下和光滩)土壤为研究对象,通过对不同土层深度(0~10cm和10~20cm)的土壤有机碳(SOC)、全氮(TN)和全磷(TP)含量进行测定,分析海岸带沙地土壤碳氮磷生态化学计量学特征,比较林下和光滩的差异,探究其对土壤碳氮磷含量和化学计量学特征的影响,并对海岸带碳储量进行估算。结果表明:林下0~10cm土层SOC、TN和TP的平均含量分别为4.33、0.38和0.26g·kg^-1,光滩相同深度土层SOC、TN、TP平均含量分别是1.77、0.21和0.19g·kg^-1;林下10~20cm土层SOC、TN和TP的平均含量为3.05、0.35和0.18g·kg^-1,光滩相同深度土层SOC、TN和TP平均含量分别是1.18、0.23和0.15g·kg^-1。海岸带沙地0~10cm和10~20cm土层的平均碳氮比(C∶N)分别为12.44和8.79。相关性分析表明,林下和光滩土壤TN含量均与年平均气温显著正相关,光滩土壤SOC含量与年均气温显著正相关。估算出海南岛海岸带0~20cm土层土壤的碳储量约为4.08Tg。虽然海南岛海岸带沙地土壤的碳氮磷含量及其化学计量比普遍较低,但海防林能显著改善土壤碳氮磷养分,提高土壤碳储量。
C,N,and P content,as well as their stoichiometry,provide theoretical basis for evaluating the improvement in soil nutrient composition and C sink function in soils of coastal shelterbelts.The sandy soil samples from 24 sites were collected in duplicate(shelter belts were of Casuarina equisetifolia and on bare beach)at different soil depths(0-10 cm and 10-20 cm)from 12 counties around the coastal zone of Hainan Island.The soil organic C(SOC),total N(TN),total P(TP),and C∶N ratio were measured.The differences in SOC,TN,and TP content between the shelterbelts and the bare beaches were compared,and the factors influencing these variables were analyzed.The results showed that the average values of SOC,TN,and TP at the depth of 0-10 cm in the coastal shelterbelts were 4.33,0.38,and 0.26 g·kg^-1,respectively,while those of the soil in bare beaches,were 1.77,0.21,and 0.19 g·kg^-1.Similarly,the average values of SOC,TN,and TP at the depth of 10-20 cm in the coastal shelterbelt was 3.05,0.35,and 0.18 g·kg^-1,respectively,while the values at the same depth in the bare beaches were 1.18,0.23,and 0.15 g·kg^-1.The average soil C∶N ratio was 12.44 at the depth of 0-10 cm and 8.79 at depth of 10-20 cm in the coastal sandy soils.There was a significant correlation between TN and the annual mean temperature in both the coastal shelterbelts and bare beaches,and between SOC and annual mean temperature only in the bare beaches.SOC storage was approximately 4.08 Tg at the depth of 0-20 cm in the coastal area of Hainan Island.The results indicated that there were generally low SOC,TN,and TP content and C∶N ratio in the sandy soil in the coastal zone of Hainan Island,while the coastal shelterbelts play significant roles in the improvement of soil nutrient content.
作者
张书齐
许全
杨秋
蒋亚敏
王旭
刘文杰
ZHANG Shuqi;XU Quan;YANG Qiu;JIANG Yamin;WANG Xu;LIU Wenjie(College of Ecology and Environment,Hainan University,Haikou,Hainan 570228,China)
出处
《森林与环境学报》
CSCD
北大核心
2019年第4期398-403,共6页
Journal of Forest and Environment
基金
海南省自然科学基金项目(417050,418MS019)
国家自然科学基金地区科学基金项目(41663010)
海南大学科研启动项目(kydq1604,kyqd1605)
关键词
海岸带
碳氮比
海防林
木麻黄
海南岛
coastal zone
C∶N ratio
coastal shelterbelts
Casuarina equisetifolia
Hainan Island
作者简介
第一作者:张书齐(1991-),男,硕士研究生,从事林业生态学研究。Email:ZhangSQ0929@126.com;通信作者:杨秋(1981-),讲师,硕士生导师,从事热带生态环境研究。Email:yangqiu0903@163.com。
