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Effect. of clump spacing on nut.ient.dist.ibut.on and root.act.vit. of Dendrocalamus st.ict.s in t.e humid region of k.rala,peninsular India

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Journal of Forest.y Research 2017年第6期28卷 1133-1144页

作者： B. H. k.t.ur k. Sudhak.ra B. Mohan k.mar t. k. kunhamu P. Sureshk.mar Depart.ent.of Silvicult.re and Agroforest.y College of Forestry Kerala Agricultural UniversityVellanikkara Thrissur Kerala 680656 India School of Ecology and Environment.St.dies Nalanda University Rajgir District Nalanda Bihar 803116 India Depart.ent.of Soil Science and Agricult.ral Chemist.y Radio-tracer Laboratory College of Horticulture Kerala Agricultural University Vellanikkara ThrissurKerala 680656 India

t.e humid agroclimat.c condit.ons of k.rala,India permit.t.e cult.vat.on of an array of bamboo species of which Dendrocalamus st.ict.s Roxb.(Nees.) is an import.nt.one on account.of it. high growt. rat. and mult.ple uses. St.nd densit., a pot.nt.al t.ol in cont.olling t.e product.vit. of woody ecosyst.ms, it. effect.on growt. and root.dist.ibut.on pat.erns may provide a bet.er underst.nding of product.vit. opt.mizat.on especially when bamboo-based int.rcropping opt.ons are *** at.ribut.s of 7-year-old bamboo(D. st.ict.s) st.nds managed at.variable spacing(4×4 m, 6×6 m, 8×8 m,10×10 m, 12×12 m) were st.died. Funct.onal root.act.vit. among bamboo clumps were also st.died using a radio t.acer soil inject.on met.od in which t.e radio isot.peP was applied t. soil at.varying dept.s and lat.ral dist.nces from t.e clump. Result. indicat. t.at.spacing exert. a profound influence on growt. of bamboo. Widely spaced bamboo exhibit.d higher clump diamet.rs and crown widt.s while clump height. were bet.er under closer spacing. Clump height.was 30% lower and DBH 52%higher at.t.e widest.spacing(12×12 m) compared t. t.e closest.spacing(4×4 m). Wit. increasing soil dept. and lat.ral dist.nce, root.act.vit. decreased significant.y. Root.act.vit. near t.e clump base was highest.809 count. per minut., cpm; 50 cm dept. and 50 cm lat.ral dist.nce) at.4×4 m. t.acer st.dy furt.er showed wider dist.ibut.on of root.act.vit. wit. increase in clump spacing. It.may be concluded t.at.t.e int.nsive foraging zone of bamboo is wit.in a 50-cm radius around t.e clump irrespect.ve of spacing. N, P and k.cont.nt.in t.e upper 20 cm was 2197,21, and 203 k./ha respect.vely for t.e closely spaced bamboo(4×4 m) which were significant.y higher t.an corresponding nut.ient.cont.nt.at.wider spacings. About.50% of N, P and k.were present.wit.in t.e 0–20 cm soil layer, which decreased drast.cally beyond t.e 20 cm *** result. suggest.t.at.st.nd management.pract.ces t.rough plant.ng densit. regula

关键词： Bamboo Clump spacing Funct.onal root.act.vit. Radio t.acer 32P Soil nut.ient.

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