Objective The current research aimed to study the effects of adding Taihu Lake silt to cultivation substrates on the germination and early growth of tall fescue seeds,and to promote the application of water silt in landscaping and gardening. Methods Cultivation substrates were prepared by mixing Taihu Lake silt with vermiculite in gradients of 25% volume. Five treatments were designed: 100% vermiculite(T1), 25% Taihu Lake silt+75% vermiculite(T2), 50% Taihu Lake silt+50% vermiculite(T3), 75% Taihu Lake silt+25% vermiculite(T4), and 100% Taihu Lake silt(T5). Seeds were sown in different cultivation substrates, and the cultivation effects of each treatment were evaluated based on plant performance indicators such as germination rate and plant height. Additionally, the effects of the leachate from each treatment on seed germination was investigated. To identify the key factors affecting the growth of seedlings, hydroponic experiments were conducted using leachate from each treatment, and various growth indicators of seedlings from each treatment were measured. Results The results indicated that with increasing addition of Taihu Lake silt, the root length, germination potential, and germination index of seeds were significantly improved, with a 100% germination rate observed in all treatments. As a cultivation substrate, the optimal addition of Taihu Lake silt was 25%. However, with increasing levels of Taihu Lake silt, the germination rate, plant height, chlorophyll content, root length, and biomass of tall fescue seeds exhibited a significant declining trend. Correlation analysis indicated a negative correlation between cultivation substrate bulk density, pH, alkaline nitrogen, available phosphorus, quick-acting potassium, organic matter content, and growth indicators of seedlings. Moreover, with increasing levels of Taihu Lake silt, the leachate from the cultivation substrate showed a significant promoting effect on the growth indicators of tall fescue seedlings. Conclusion The addition of Taihu Lake silt at 25% in cultivation substrate composed of a mixture with vermiculite promoted the growth of tall fescue seedlings to a certain extend,but exceeding 25% may have inhibitory effects. The physical properties of Taihu Lake silt, especially bulk density, are key factors influencing its cultivation effects.
供试太湖淤泥取自江苏省苏州市吴中区太湖清淤点,经自然风干并粉碎过2 mm筛后进行试验,供试原料理化性质详见表1。供试草种为高羊茅(Festuca elata Keng ex E.B. Alexeev),购自江苏麦禾种业有限公司,该草种适用于高尔夫球场、运动场、园林绿化和水土保持等各类草坪。供试蛭石购自广东辰兴农业有限公司。高羊茅种子发芽率测定值为100%,符合试验要求。
JiangY, HouJ, ChenJ F, et al. Strength characteristics of stabilized sludge by desulphurization ash and cement and application of stabilization-vacuum filtration method[J].Journal of Southeast University(Natural Science Edition),2023,53(3):519-525.
WangG B, ZhangY, LuH Q, et al. Experimental study on horizontal static load of single pile in silt soil foundation[J].Engineering Journal of Wuhan University,2020,53(S1):125-129.
WangL T, XuY F, ChenW F, et al. Experimental study on bacterial residue-modified dredged silt for ryegrass cultivation[J].Journal of Changjiang River Scientific Research Institute,2023,40(10):74-79.
ShiY N, ZhanC, ZhangC J, et al. Experiments on stabilizing treatment of polluted silt solidification and planting performance[J].Advances in Science and Technology of Water Resources,2021,41(2):89-94.
SunB W, SunW N, FuC F, et al. Spatial distribution characteristics and assessment on pollution status of heavy metals in sediments of Baiyangdian Lake[J].Water Resources and Hydropower Engineering,2021,52(11):173-185.
ZhangJ L. Study on application of direct planting and greening of container seedlings of Fraxinus mandshurica in Caofeidian Area,Tangshan City[J].Modern Agricultural Science and Technology,2018(22):165,167.
XiongJ F, ChenY C, GuoM, et al. Study on the sediment from Dianchi Lake as media on the growth and flowering of Salvia splendens [J].Northern Horticulture,2011(12):66-68.
YanX P, MaoY, JiangS Z, et al. Effect of different solidifying agent content on physical and chemical properties of lake silt and growth of turfgrass[J].Northern Horticulture,2015(20):155-158.
YuanP, LiuJ W, FangY C, et al. Effect of modified silt substrate on the growth of Chrysanthemum morifolium [J].Hunan Agricultural Sciences,2023(8):12-16.
LiuX Y, SongP, LinY F, et al. Study on the ratio of food waste compost and peat to cucumber seedling substrate[J].Journal of Shanxi Agricultural University(Natural Science Edition),2022,42(1):35-42.
Ministry of Agriculture and Rural Affairs of the People's Republic of China. NY/T 525-2021 Organic fertilizer [S].Beijing:China Agriculture Press,2021:1-13.
HuangY Q, YangJ F, LiangC H, et al. Effects of vanillic acid on seed germination, seedling growth and rhizosphere microflora of peanut[J].Scientia Agricultura Sinica,2018,51(9):1735-1745.
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China. GB/T 33891-2017 Organic media for greening [S]. Beijing:2017:1-36.
CuiL, JiangQ, NieS H. Study on yield stress measurement and characteristics of mud in the Yangtze River Estuary[J].Journal of Sediment Research,2020,45(2):31-37.
ZhangY J, SunB, ZhaoX L. The pollution evaluation of heavy metals in sediment from country freshwater and the resource use[J].Journal of Agro-Environment Science,2008,27(4):1398-1402.
State Forestry Administration of the People's Republic of China. LY/T 1970-2011 Organic media for greening[S]Beijing:Standards Press of China, 2011:1-8.
ZhaoS L, DuoL A, WangX L, et al. Turf established by sod with municipal solid waste compost as medium and waste materials as netting[J].Acta Botanica Boreali-Occidentalia Sinica,2007,27(1):126-131.
ChaiW G, PanX L, DuD F, et al. An experiment of the sediment from West Lake as organic substrate for greenhouse culture[J].Environmental Pollution&Control,2003(2):113-115.