文章摘要
杜佳囝, 李广, 马维伟, 杨传杰, 刘帅楠, 徐万恒, 谢明君.黄土丘陵区4种典型植被土壤可溶性氮组分特征[J].水土保持学报,2021,35(6):251~257
黄土丘陵区4种典型植被土壤可溶性氮组分特征
Characteristics of Soil Soluble Nitrogen Components Under Four Typical Vegetations in the Loess Hilly Areas
投稿时间:2021-05-29  
DOI:10.13870/j.cnki.stbcxb.2021.06.034
中文关键词: 黄土丘陵区  植被类型  可溶性有机氮  铵态氮  硝态氮
英文关键词: loess hilly district  vegetation type  soluble organic nitrogen  ammonium nitrogen  nitrate nitrogen
基金项目:甘肃省重点人才项目(LRYCZ-2020-1);甘肃省重点研究发展计划项目(20YF8NA135);甘肃省财政专项(GSCZZ 20160909)
作者单位E-mail
杜佳囝, 李广, 马维伟, 杨传杰, 刘帅楠, 徐万恒, 谢明君 甘肃农业大学林学院, 兰州 730070 lig@gsau.edu.cn 
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中文摘要:
      土壤可溶性氮组分是氮循环中最活跃的一环,是联系"植物—土壤氮组分—土壤养分"的关键纽带。为探讨植被类型对黄土丘陵区土壤氮素累计及其有效性的影响,以黄土丘陵区4种典型植被(荒草地、沙棘林地、文冠果林地、云杉林地)为研究对象,分析0—10,10—20,20—40 cm土层可溶性有机氮(SON)、铵态氮(NH4+—N)、硝态氮(NO3-—N)含量,密度及其所占TN比例在不同植被间的差异。结果表明:与荒草地相比,0—40 cm土层中SON含量整体表现为云杉林地最高(19.0%),文冠果林地和沙棘林地分别减少7.0%,13.2%,NO3-—N含量为沙棘林地最高(20.9%),文冠果林地和云杉林地分别减少5.0%,48.0%,3种植被与荒草地相比NH4+—N含量减少19.0%~29.1%;同样,云杉林地SON密度增加31.17%,沙棘林地与文冠果林地分别减少12.8%,4.3%,沙棘林地NO3-—N密度增加21.4%,文冠果林地、云杉林地分别减少3.5%,42.6%,其余植被NH4+—N密度减少16.4%~32.8%;可溶性氮组分占TN比例中,仅沙棘林地NO3-—N占TN比例最高,相比于荒草地增加1.2倍。相关分析表明,可溶性氮组分受TN与MBN的影响大于SOC和MBC。综上,不同植被类型对可溶性氮组分含量、密度及占全氮比例有较大影响,并增加氮素的有效性,以云杉、沙棘的提升效果最好。
英文摘要:
      The soluble nitrogen component of soil is the most active part of the nitrogen cycle, and it is the key link between "plants-soil nitrogen components-soil nutrients". Therefore, in order to explore the effects of vegetation types on the accumulation and availability of soil nitrogen in the loess hilly and gully region, this paper took four typical vegetations (barren grassland, Hippophae rhamnoides, Xanthoceras sorbifolium, Picea asperata) as the research objects. We analyzed the difference of soluble organic nitrogen (SON), ammonium nitrogen (NH4+—N), nitrate nitrogen (NO3-—N) contents, density and the proportion of TN in the 0—10, 10—20, 20—40 cm soil layers. The results showed that compared with the barren grassland, the SON content in the 0—40 cm soil layer showed the highest performance in Picea asperata (19.0%), and the SON contents under Xanthoceras sorbifolium and Hippophae rhamnoides were decreased by 7.0% and 13.2% respectively. The NO3-—N content was the highest under Hippophae rhamnoides (20.9%), and the contents under Xanthoceras sorbifolium and Picea asperata were decreased by 5.0% and 48.0% respectively. Compared with barren grassland, the NH4+—N contents under three vegetations were decreased by 19.0%~29.1%. Similarly, the SON density of Picea asperata was increased by 31.17%, and the values under Hippophae rhamnoides and Xanthoceras sorbifolium were decreased by 12.8% and 4.3% respectively. The NO3-—N density of Hippophae rhamnoides was increased by 21.4%, and the NO3-—N densities under Xanthoceras sorbifolium and Picea asperata were decreased by 3.5% and 42.6% respectively. The NH4+—N densities of the other vegetations were decreased by 16.4%~32.8%. In addition, among the proportion of soluble nitrogen in TN, only Hippophae rhamnoides NO3—N accounted for the highest proportion of TN, which was 1.2 times higher than that of wasteland. Correlation analysis showed that the soluble nitrogen component was more affected by TN and MBN than SOC and MBC. In summary, different vegetations had great impact on the soluble nitrogen content, density and the proportion of total nitrogen. Among them, Picea asperata and Hippophae rhamnoides had the better effect on increasing nitrogen availability.
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