Abstract：[Background] Horqin sandy land is a national key ecological environment construction area and a typical ecological fragile area. In recent years, wind erosion and soil erosion are serious in this area. Elm forest is the most stable vegetation type in sandy land. It is not only the climax community of vegetation succession in sandy land, but also the ecological tree species most suitable for local climate conditions. However, due to the limitation of soil moisture and nutrients, the ecological function degradation and low efficiency of some elm forests has become increasingly prominent with the growth of elm forests. At present, the focus of vegetation restoration and ecological reconstruction in sandy land should be on the management of the existing plantation.[Methods] Taking young 18 a, middle-aged 26 a, mature 32 a elm trees of three different forest ages in Wengniute banner as the research object, the nutrient change characteristics of 0-10, 10-20 and 20-40 cm soil layers were analyzed. With the PCA-TOPSIS evaluation system, the data sets were firstly subjected to dimension reduction analysis using principal component analysis method, and the dynamic scores of soil nutrients at different forest ages were further discussed and evaluated combined with TOPSIS method, and then the nutrient indexes of the appropriate age for the sandy land were screened out. The nutrient index and plant growth index of MDS (minimum data set) were calculated by weighted TOPSIS, and the result score was calculated.[Results] The cumulative PCA contribution rates of soil available nitrogen, available potassium and polyphenol oxidase were all greater than 0.9, indicating that they had a positive effect on soil quality, and the more the index, the better. The highest available nitrogen score in Z treatment (26 a) was 1, followed by Y treatment (18 a), which was 0.467. The highest value of soil available potassium was 0.84 in C treatment (32 a). The highest value of soil polyphenol oxidase score was Z treatment (1), followed by C treatment (0.645), and the lowest value was Y treatment (0.159). Result The score linear regression passed the F test (F=398.629, P<0.05), R2=0.996, and the TOPSIS score of available nitrogen represented 99.6% of the growth index, indicating that available nitrogen was the nutrient factor next to available potassium. Polyphenol oxidase R2=0.990, which had a high regression fitting degree with growth factors, and the score value was reliable after verification, and can also be used as a positive effect index of elm forest soil.[Conclusions] There are varied different differences in soil nutrient and enzyme activity indexes at different forest ages, and the same index presents has significant differences at different forest ages. According to the entropy weight score of soil index, the proportion and cycle of chemical fertilizer application should be properly controlled or adjusted at different forest ages to better improve the growth of local elm trees and enhance the soil fertility.
李俊杰, 李钢铁, 麻云霞, 张月欣, 胡博, 张金旺, 王月林. 基于PCA-TOPSIS的沙地不同林龄榆树土壤养分评价[J]. 中国水土保持科学, 2022, 20(5): 17-23.
LI Junjie, LI Gangtie, MA Yunxia, ZHANG Yuexin, HU Bo, ZHANG Jinwang, WANG Yuelin. Soil nutrient evaluation of elm trees with different stand ages in sandy land based on PCA-TOPSIS. SSWC, 2022, 20(5): 17-23.
闫升,杨建英,史常青,等.基于AHP-PCA的铁尾矿不同植被恢复模式土壤养分评价[J].中国水土保持科学,2019,17(6):111. YAN Sheng, YANG Jianying, SHI Changqing, et al. Soil nutrient evaluation of iron tailings under different vegetation restoration modes based on AHP-PCA[J]. Science of Soil and Water Conservation,2019,17(6):111.
[2]
杨霞,陈丽华,郑学良.不同林龄油松人工林土壤碳、氮和磷生态化学计量特征[J].中国水土保持科学,2021,19(2):108. YANG Xia, CHEN Lihua, ZHENG Xueliang. Ecological stoichiometry of soil carbon, nitrogen and phosphorus in Pinus tabulaeformis plantations at different ages[J]. Science of Soil and Water Conservation, 2021,19(2):108.
[3]
曹小玉,李际平,闫文德.不同龄组杉木林土壤有机碳与氮磷钾分布特征及耦合关系[J].土壤通报,2014,45(5):1137. CAO Xiaoyu, LI Jiping, YAN Wende.Variation of contents of soil organic carbon, N, P and K and their coupling relationships in different age groups of Chinese fir plantations[J].Chinese Journal of Soil Science,2014,45(5):1137.
[4]
杨晓娟,王海燕,刘玲,等.不同林龄长白落叶松人工林土壤肥力[J].东北林业大学学报,2013,41(3):51. YANG Xiaojuan,WANG Haiyan,LIU Ling,et al. Soil fertility in korean larch plantations of different stand age[J].Journal of Northeast Forestry University,2013,41(3):51.
[5]
赵隽宇,石媛媛,覃祚玉,等.南亚热带桉树人工林土壤肥力障碍因子评价[J].广西师范大学学报(自然科学版),2022,40(4):205. ZHAO Juanyu, SHI Yuanyuan, TAN Zuoyu, et al. Analysis and evaluation of soil fertility obstacle factors in Eucalyptus plantation in lower subtropical region[J]. Journal of Guangxi Normal University (Natural Science Edition),2022,40(4):205.
[6]
刘娟,张乃明,邓洪.勐海县茶园土壤养分状况及肥力质量评价[J].农业资源与环境学报,2021,38(1):79. LIU Juan, ZHANG Naiming, DENG Hong. Soil nutrient status and fertility evaluation of tea gardens in Menghai county[J]. Journal of Agricultural Resources and Environment, 2021, 38(1):79.
[7]
孙娇,赵发珠,韩新辉,等.不同林龄刺槐林土壤团聚体化学计量特征及其与土壤养分的关系[J].生态学报,2016,36(21):6879. SUN Jiao, ZHAO Fazhu, HAN Xinhui, et al. Ecological stoichiometry of soil aggregates and relationship with soil nutrients of different-aged Robinia pseudoacacia forests[J].Acta Ecologica Sinica,2016,36(21):6879.
[8]
张毅,敖妍.内蒙古翁牛特旗文冠果优良单株的选择[J].中南林业科技大学学报,2019,39(9):48. ZHANG Yi,AO Yan.Superior individual selection of Xanthoceras sorbifolium Bunge in Inner Mongolia Wengniute Banner[J].Journal of Central South University of Forestry & Technology,2019,39(9):48.
[9]
鲍士旦.土壤农化分析[M].北京:中国农业出版社,2000:1 BAO Shidan. Soil agrochemical analysis[M]. Beijing:China Agriculture Press, 2000:1.
[10]
关松荫.土壤酶与土壤肥力[J].土壤通报,1980(6):41. GUAN Songyin. Soil enzymes and soil fertility[J]. Chinese Journal of Soil Science,1980(6):41.
[11]
赵丹阳,毕华兴,侯贵荣,等.不同林龄刺槐林植被与土壤养分变化特征[J].中国水土保持科学,2021,19(3):56. ZHAO Danyang,BI Huaxing,HOU Guirong, et al. Evolution of vegetation and soil nutrients of artificial Robinia pseudoacacia forest[J].Science of Soil and Water Conservation,2021,19(3):56.
[12]
王棣,耿增超,佘雕,等.秦岭典型林分土壤有机碳储量及碳氮垂直分布[J].生态学报,2015,35(16):5421. WANG Di, GENG Zengchao, SHE Diao, et al.Soil organic carbon storage and vertical distribution of carbon and nitrogen across different forest types in the Qinling Mountains[J].Acta Ecologica Sinica,2015,35(16):5421.
[13]
王宁,张有利,王百田,等.山西省油松林生态系统碳氮磷化学计量特征[J].水土保持研究,2015,22(1):72. WANG Ning, ZHANG Youli, WANG Baitian, et al. Stoichiometry of carbon,nitrogen and phosphorus in Pinus tabulaeformis Carr.forest ecosystems in Shanxi province, China[J]. Research of Soil and Water Conservation, 2015,22(1):72.
[14]
牛小云,孙晓梅,陈东升,等.辽东山区不同林龄日本落叶松人工林土壤微生物、养分及酶活性[J].应用生态学报,2015,26(9):2663. NIU Xiaoyun, SUN Xiaomei, CHEN Dongsheng, et al. Soil microorganisms, nutrients and enzyme activities of Larix kaempferi plantations at different ages in eastern Liaoning mountainous area[J]. Chinese Journal of Applied Ecology, 2015,26(9):2663.
2022, Vol. 20 
