采用土柱离子交换包法，研究了苏北地区不同连栽代次杨树人工林土壤氮矿化的状况及耕作措施对二代杨树林土壤氮矿化的影响。结果表明：不同代次的杨树人工林土壤氨化速率的季节变化较为一致，二代林土壤的氨化速率和一代林相比，并未出现明显的降低，有的月份(4、7月)甚至高于一代林。二代林的硝化速率和净氮矿化速率明显低于一代林，尤其是在3、4、5月份。耕作措施虽然增加了二代林土壤氮素年氨化量、硝化量和矿化量，但由于也相应地增加了年淋溶量(约占年矿化量的49.15%)，因此土壤中的无机氮含量反而低于免耕处理。
Abstract
By the method of in situ soil coreion exchange resin bag (ISCIERB), the characteristics of soil nitrogen mineralization in the different successive rotation stands of poplar plantation (the first rotation of fouryearold and the second rotation of fouryearold) and the effects of tillage on the soil nitrogen mineralization in the second rotation of fouryearold poplar plantation were studied in north Jiangsu province. The results showed that the seasonal changes of soil ammonification rate in two rotation stands were similar. The soil ammonification rate in the second rotation stand was not obviously decreased and even increased in April and July, compared with the first rotation stand. However, the soil nitrification rate and net mineralization rate in the second rotation stand were significantly lower than that in the first rotation stand, especially in March, April and May. Compared with the notillage, the annual ammonified, nitrified and mineralized nitrogen of soil in the second rotation stand treated with the tillage were increased. Meanwhile, the tillage treatment was obviously increased the soil N lose by leaching which accounted for 49.15% of the total annual mineralized N, therefore soil inorganic N content was lower in the stand treated with tillage than that in the stand with notillage.
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