【摘要】：為了將基質(zhì)壓實發(fā)展為改善立地、促進(jìn)生產(chǎn)的技術(shù)手段,運(yùn)用在農(nóng)林業(yè)生產(chǎn)中,研究不同程度壓實后基質(zhì)持水能力及水分動態(tài)變化特征。試驗布設(shè)5個試驗槽,標(biāo)記為T1~T5,T1為對照,基質(zhì)自然沉降,T2~T5經(jīng)過碾壓后,容重分別為對照容重的1.25、1.50、1.75、2.00倍。2012~2013年定期測量1 m內(nèi)基質(zhì)體積含水量,通過變異系數(shù)評價含水量的時間變異性和垂直、水平方向上的空間變異性。結(jié)果表明,隨著壓實程度增加,基質(zhì)含水量顯著增加,時間變異系數(shù)和垂直、水平方向上的空間變異系數(shù)下降。隨著植物根系的發(fā)展,T1~T4深層含水量的時間變異系數(shù)升高。T5淺層含水量的時間變異系數(shù)和水平變異系數(shù)均較高,由于含水量的時間和水平異質(zhì)性可以反映根系活動,結(jié)果表明重度壓實限制植物根系發(fā)展。
[Abstract]:In order to develop the matrix compaction into the technical means of improving site and promoting production, the characteristics of water holding capacity and water dynamic change of matrix after different degree compaction were studied in agriculture and forestry production. Five test tanks were set up and labeled as T1T5T1as control. After compaction, the bulk density of natural sedimentation T2T5 of the control was 1.25 / 1.50 / 1.752.00 times as much as that of the control, respectively. The volume water content of 1 m substrate was measured regularly from 2012to 2013. The temporal variability, vertical and horizontal spatial variability of water content were evaluated by coefficient of variation. The results showed that with the increase of compaction degree, the moisture content of the matrix increased significantly, and the temporal variation coefficient, vertical and horizontal spatial variation coefficient decreased. With the development of plant root system, the time variation coefficient of deep water content of T1T4 increased. The temporal variation coefficient and horizontal variation coefficient of shallow water content in T5 layer were higher. The time and level heterogeneity of water content could reflect root activity. The results showed that severe compaction limited the development of plant roots.
【作者單位】： 輕工業(yè)環(huán)境保護(hù)研究所;北京林業(yè)大學(xué)水土保持學(xué)院;中科鼎實環(huán)境工程有限公司;
【基金】：國家林業(yè)公益性行業(yè)科研專項“建設(shè)工程損毀林地植被恢復(fù)關(guān)鍵技術(shù)研究與示范”(200904030)
【分類號】：S152

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