滨海盐碱地改良对绿地碳汇效益影响的研究

以小叶栀子（Gardenia jasminoides‘prostrata’） 、中华常春藤（Hedera nepalensis 〖WTBZ〗var.〖WTBX〗sinensis）、紫鸭跖草(Setcreasea purpurea)、红花酢浆草（Oxalis corymbosa）4种植物为研究对象，探讨了土壤盐碱地改良对绿地碳汇功能的影响。结果表明：碎石铺设、有机肥和粉碎秸秆3种土壤盐碱地改良方法中，有机肥的施入对土壤有机碳含量和植物生长的影响最大，该措施有利于土壤和植物碳储量的增加；不同土壤处理的有机碳矿化规律表现出很好的一致性，前期碳释放量大，后期释放量少，当埋入4 cm厚的碎石隔离层，施入20 kg/m2有机肥和2 kg/m2粉碎秸秆，其CO2总的释放量最多；总体而言，土壤盐碱改良处理仅施入粉碎秸秆1 kg/m2后，绿地碳汇能力最低，处于碳亏损状态，通过施入有机肥20 kg/m2和粉碎秸秆3 kg/m2的改良措施，其外源碳汇最大，整体绿地碳汇效益也最好。〖

EFFECTS OF AMELIORATION METHODS ON CARBON SINK BENEFIT OF GREEN SPACE IN COASTAL SALINE-ALKALINE LAND

Gardenia jasminoides〖WTBZ〗‘prostrata’,〖WTBX〗Hedera nepalensis〖WTBZ〗 var.〖WTBX〗sinensis,Setcreasea purpurea〖WTBZ〗 and 〖WTBX〗Oxalis corymbosa〖WTBZ〗 had been studied for the effect of amelioration methods on function of carbon sink of green space.The results showed that among three kinds of soil amelioration methods such as stone paving,organic fertilizer,and crushed straw,the organic fertilizer applied had the greatest effect on soil organic carbon content and plant growth,which was conductive to the increase of soil and plant carbon storage.In different treatments mineralization law of soil organic carbon preasented the great consistency,which showed the change trend of decreasing from earlier stage to later carbon emission.The treatment 8 with thickness of stone paving for 4cm,amount of organic fertilizer for 20 kg/m2 and amount of crushed straw for 2 kg/m2 had the most carbon emission amount.Consequently,the function of carbon sink of treatment 1 only with amount of crushed straw for 1 kg/m2 was in the lowest level,showing state of carbon loss.Conversely,the amelioration method of treatment 9 with amount of organic fertilizer for 20 kg/m2 and amount of crushed straw for 3 kg/m2 had the most exogenous carbon sink and the best carbon sink function of green space.〖HJ1〗〖HJ〗