冰雪灾害对粤北杉木林凋落物储量及养分动态的影响  

Effect of Ice-Storm Damage on Mass Accumulation and Nutrient Dynamics of Litter Layer in a Cunninghamia lanceolata Stand in the Northern Guangdong

作　　者：许建新[1,2] 侯晓丽[1] 薛立[1] 

机构地区：[1]华南农业大学林学院,广东广州510642 [2]深圳市铁汉生态环境股份有限公司,广东深圳518040

出　　处：《西南林业大学学报（自然科学）》2015年第5期27-31,共5页Journal of Southwest Forestry University：Natural Sciences

基　　金：深圳市战略性新兴产业专项资金项目(GCZX20120618100801416)资助

摘　　要：为明确冰雪灾害对粤北杉木林凋落物层储量及其养分动态的影响,2008—2011年于冰雪灾害后的杉木人工林内建立样方,测定样方内N、P、K养分的变化情况。结果表明：冰雪灾害后1~4 a衫木林凋落物层的储量分别为15.97、9.96、11.20和12.43 t/hm2,表现为先降后升,凋落物层N含量呈现波动上升趋势,P含量为升—降—升,K含量急剧下降后又波动;冰雪灾害后1~4 a的凋落物层N累积量分别为107.80、91.38、99.67和136.84 kg/hm2,P累积量分别为7.83、6.05、6.21和7.74 kg/hm2,均为先降后升,K储量分别为69.95、9.06、14.81和14.23 kg/hm2,呈现为显著下降后波动;凋落物层的养分含量和累积量为N〉K〉P。冰雪灾害后1 a输入了大量的林冠残体到杉木林地,增加了土壤肥力,加快了养分循环速度。In order to research the effect of snow and ice disaster on the litter layer storage and nutrient of a Cunninghamia lanceolata stand in the north of Guangdong province in 2008 -2011 year, some quadrates of Cunninghamia lanceolata stand were established after snow storm disturbance, and then was measured the variation of N, P and K. The results showed that the mass of litter layer was 15.97 t/hm2, 9.96 t/hm2, 11.20 t/hm2 and 12.43 t/hm2, respectively in four years, with a trend of decrease followed by an increase. N contents appeared rising trend in four years, P contents increased firstly and then decreased followed by an increase. In contrast, K contents sharply decreased followed by a fluctuation in four years. N accumulation was 107.80 kg/hm2, 91.38 kg/hm2, 99.67 kg/hm2 and 136.84 kg/hm2 in four years, respectively. P accumulation was 7. 83 kg/hm2, 6. 05 kg/hm2, 6. 2 kg/hm2 and 7.74 kg/hm2 in four years, respectively. K accumulation was 69.95 kg/hm2, 9.06 kg/hm2, and 14. 81 kg/hm2 in four years, respectively. The nutrient content and nutrient amount in litter layer were in the order of N 〉 K 〉 P. After snow storm disturbance, large of crown debris were input in the stand in one year after snow and ice disaster, which improved soil fertility and accelerated nutrient cycling.

关 键 词：冰雪灾害 杉木林 凋落物层 储量 养分动态 

分 类 号：S714.2[农业科学—林学]