CAJ | 학술논문

为了解短期（两年）氮添加对土壤物理结构的影响，采用野外调查取样和室内分析结合的方法，对盐城市东台林场中不同龄级杨树人工林进行施氮试验，分析土壤表层（0～10 cm）水稳态土壤团聚体直径以及细根生物量的变化。结果表明：1）不同林龄杨树人工林土壤团聚体粒径受细根生物量影响显著增大，对于氮素输入的响应规律各不相同，5年生林土壤对氮添加的响应比9年生和16年生林反应明显；2）轻度氮添加（每年5 g／m2）有利于土壤物理结构改善，而中等浓度氮添加（每年10 g／m2）会造成大直径团聚体质量百分比减少，导致土壤团聚体平均直径下降；3）细根生物量与大直径土壤团聚体的质量百分比呈线性正相关。因此，林龄与氮添加导致的细根生物量的增大有利于大直径土壤团聚体的形成。
위료해단기（량년）담첨가대토양물리결구적영향，채용야외조사취양화실내분석결합적방법，대염성시동태림장중불동령급양수인공림진행시담시험，분석토양표층（0～10 cm）수은태토양단취체직경이급세근생물량적변화。결과표명：1）불동림령양수인공림토양단취체립경수세근생물량영향현저증대，대우담소수입적향응규률각불상동，5년생림토양대담첨가적향응비9년생화16년생림반응명현；2）경도담첨가（매년5 g／m2）유리우토양물리결구개선，이중등농도담첨가（매년10 g／m2）회조성대직경단취체질량백분비감소，도치토양단취체평균직경하강；3）세근생물량여대직경토양단취체적질량백분비정선성정상관。인차，림령여담첨가도치적세근생물량적증대유리우대직경토양단취체적형성。
The water-stable aggregates’diameter and fine roots’biomass in different surface soil layers (0 ~ 10 cm)of poplar plantations with different stand age applied with different nitrogen level were determined by field survey and indoor analysis to study the effect of nitrogen addition (during two years) on soil physical structure.The results showed that:1)The biomass of fine roots has the significant effect on water-stable aggregates’diameter of poplar plantations with different stand age,and soil response of Poplar plantations with 5-year age to nitrogen addition is higher than Poplar plantations with 9-year age and 16-year age obviously;2)Mild nitrogen addition (5 g/m2·y)can improve the soil physical structure. but medium nitrogen addition (10 g/m2·y)can reduce mass percentage of water-stable aggregates with larger diameter,which results in decrease of average diameter of soil aggregates;3)There is a positive correlation between fine roots’biomass and mass percentage of soil aggregates with larger diameter. Therefore,the increase of fine roots’biomass caused by stand age and nitrogen addition is beneficial to formation of soil aggregates with larger diameter.