本文選題：低質(zhì)林 + 低質(zhì)林改造�。� 參考：《東北林業(yè)大學(xué)學(xué)報(bào)》2017年08期

【摘要】：依據(jù)低質(zhì)林改造更新?lián)嵊到y(tǒng)的養(yǎng)分循環(huán)過程,采用內(nèi)部集散物流分析、物質(zhì)流分析方法,建立低質(zhì)林改造更新?lián)嵊到y(tǒng)養(yǎng)分元素流動(dòng)數(shù)學(xué)模型;應(yīng)用實(shí)地調(diào)查數(shù)據(jù)對(duì)模型有效性驗(yàn)證后,運(yùn)用模型對(duì)研究區(qū)內(nèi)低質(zhì)林更新階段(2008—2015年)的營(yíng)養(yǎng)元素積累與循環(huán)情況進(jìn)行模擬分析。結(jié)果表明:通過營(yíng)養(yǎng)元素流動(dòng)模型得到的土壤養(yǎng)分指標(biāo),預(yù)測(cè)值與實(shí)測(cè)值之間的相關(guān)系數(shù),水解N為0.87、有效P為0.77、速效K為0.88,顯示了較高的模型精度。2008—2015年,更新系統(tǒng)通過降雨過程從系統(tǒng)外吸收的N、P、K,分別為320、28、120 kg/hm~(2);同時(shí)隨徑流流出系統(tǒng)的N、P、K,分別為224.0、19.6、84.0 kg/hm~(2)。林分從土壤中吸收的N、P、K,分別為26.45、4.29、11.11 kg/hm~(2);通過淋溶作用,歸還到土壤中的N、P、K,分別為0.36、0.13、0.56 kg/hm~(2)。另外,幼齡林撫育措施及逐年累積的凋落物,回流至土壤中的N、P、K,分別為4.17、0.63、1.31 kg/hm~(2);土壤中累積的營(yíng)養(yǎng)元素N、P、K,分別達(dá)到289.08、14.27、124.75 kg/hm~(2);比改造當(dāng)年均有較大幅度的增加,表明低質(zhì)林改造對(duì)于林地內(nèi)的養(yǎng)分循環(huán)具有一定的促進(jìn)作用。
[Abstract]:According to the nutrient cycling process of regeneration and tending system of low quality forest, the mathematical model of nutrient element flow in regeneration and tending system of low quality forest was established by means of internal distributed logistics analysis and material flow analysis. After the validity of the model was verified by field survey data, the nutrient accumulation and cycling of low-quality forest regeneration stage (2008-2015) in the study area were simulated and analyzed by using the model. The results showed that the correlation coefficient between the predicted value and the measured value was 0.87 for hydrolyzed N, 0.77 for available P and 0.88 for available K, which showed a high precision of the model from 2008 to 2015, the results showed that the soil nutrient index was obtained by the nutrient element flow model, and the correlation coefficient between the predicted value and the measured value was 0.87, 0.77 and 0.88 respectively. In the regeneration system, Nu Pu K absorbed from outside the system by rainfall process was 320 ~ 28120 kg / hm ~ (-1) N ~ (2 +) K, respectively, while the N ~ (2 +) P ~ (-1) K with runoff outflow system was 224.0 ~ (19.6kg) ~ (84. 0) kg 路hm ~ (-1) ~ 2 ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1). The N ~ (2 +) P ~ (+) K absorbed from the soil was 26.455 ~ 4.29 ~ 11.11 kg 路h ~ (-1) 路h ~ (-1) K, respectively, and the N ~ (2 +) P ~ (+) K was 0.36 ~ 0.13 ~ 0.56 kg 路h ~ (-1) ~ (-1) ~ 2 ~ (-1) 路h ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1), respectively. In addition, the annual accumulation of litter in young forest was 4.170.63 kg / kg 路hm ~ (2) K, respectively, and the accumulation of nutrient element in soil reached 289.08 ~ 14.27124.75 / kg / hm ~ (2), respectively, which was higher than that in the year of modification, and the amount of nutrient element in the soil was 289.08% ~ 14.27124.75 / kg / hm ~ (2), respectively, which was higher than that in the year of transformation, and the amount of nutrient element accumulated in the soil reached 289.08% 14.27124.75 / kg / hm ~ (2), respectively. The results showed that the transformation of low quality forest had a certain promoting effect on nutrient cycling in forest land.
【作者單位】： 東北林業(yè)大學(xué);
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(31400539)
【分類號(hào)】：S756.5
，

本文編號(hào)：1975250