浙江省典型地貌区果园土壤有机碳和酸碱度状况及改良对策

为了解浙江省典型区域果园土壤的质量状况，在该省丘陵、河谷平原、水网平原和滨海平原的4类地貌区选择148个代表性的果园，分析了各地貌区果园土壤有机碳和酸碱度状况及变化规律。结果表明：浙江省内果园土壤有机碳和酸碱度分别在2.64～16.58 g/kg和pH 4.15～8.42之间，平均分别为9.35 g/kg和pH 5.83。各地貌区土壤有机碳含量由高至低依次为：水网平原(11.81 g/kg)>河谷平原(10.24 g/kg)>丘陵(8.04 g/kg)>滨海平原(7.62 g/kg)；土壤pH由高至低分别为：滨海平原(6.90)>水网平原(5.76)>河谷平原(5.83)>丘陵(5.14)，丘陵区果园土壤酸化明显。随着果树种植时间的增加，河谷平原、水网平原和滨海平原土壤pH呈现显著的下降；丘陵和滨海平原区土壤有机碳呈现增加趋势。研究认为应重视丘陵区和滨海平原区果园有机物料的投入，同时加强丘陵区果园土壤酸度的校治。

Organic Carbon and Acidity and Alkalinity of Orchard Soils in Typical Geomorphic Areas of Zhejiang and Countermeasures for Improving Soil Quality

To understand the quality status of orchard soils in typical regions of Zhejiang Province, 148 representative orchards were selected from four geomorphic areas of hilly, valley, water-network and coastal plains of Zhejiang, and the status and variation regularity of soil organic carbon and acidity and alkalinity in orchard soils in different geomorphic areas were evaluated. The results showed that the soil organic carbon and pH of orchards in Zhejiang ranged from 2.64-16.58 g/kg and pH 4.15-8.42, soil organic carbon content decreased in the order of water-network plain (11.81 g/kg) > valley plain (10.24 g/kg) > hilly area (8.04 g/kg) > coastal plain (7.62 g/kg), while soil pH decreased in the order of coastal plain (6.90) > water-network plain (5.76) > valley plain (5.83) > hilly area (5.14). The soil acidification of the orchards was obvious. The soil pH decreased with planting years in valley plain, water-network plain and coastal plain, while soil organic carbon in hilly and coastal plain increased. It is suggested that attention should be paid to the input of organic materials in orchards in hilly and coastal plain areas, and lime application should be strengthened for regulating soil acidity in orchards of hilly areas.