林业科学 ›› 2020, Vol. 56 ›› Issue (11): 31-40.doi: 10.11707/j.1001-7488.20201104
韩辉1,张学利1,党宏忠2,*,徐贵军1,张晓2,王斯彤1,陈帅2,张柏习1
收稿日期:
2019-11-08
出版日期:
2020-11-25
发布日期:
2020-12-30
通讯作者:
党宏忠
基金资助:
Hui Han1,Xueli Zhang1,Hongzhong Dang2,*,Guijun Xu1,Xiao Zhang2,Sitong Wang1,Shuai Chen2,Baixi Zhang1
Received:
2019-11-08
Online:
2020-11-25
Published:
2020-12-30
Contact:
Hongzhong Dang
摘要:
目的: 通过连续、长期监测科尔沁沙地樟子松蒸腾过程,确定蒸腾用水量的年际变化规律及与降水、地下水位间的关系,明确樟子松的水分利用特征,为提高樟子松科学经营管理水平提供参考。方法: 利用热扩散式树干液流计对科尔沁沙地南缘章古台地区樟子松树干液流速率(Js)与林分生长过程开展为期9年(2010—2018年)的连续监测,并同步监测气象、地下水位、土壤水分等环境因子。结果: 中等密度的樟子松林(404株·hm-2)生长季(4—10月)的多年平均蒸腾强度为163.7 mm·a-1,最高为209.5 mm·a-1。蒸腾强度的季节变化总体上可划分为上升期(4—7月)和下降期(7—10月)2个阶段,4、7、10三个月份的日均蒸腾强度(Ts)分别为0.54、0.98和0.36 mm·d-1,日蒸腾强度最高可达1.99 mm·d-1。科尔沁沙地樟子松林分年蒸腾与年降水的比例(蒸/降比)多年平均为31.5%,在16.6%~54.7%间变动。在月尺度上,数据标准化后的樟子松蒸腾强度(Ts)与月降水量(Pr)、地下水位月均值(G)、太阳辐射月均值(PY)、0~60 cm层土壤体积含水率月均值(θ0-60 cm)间的回归关系式为:Ts=0.043 48+0.222 99×Pr-0.424 64×G+1.201 93×PY+0.307 18×θ0-60 cm(R2=0.58),太阳辐射对蒸腾强度的影响最大。结论: 科尔沁沙地南缘中等密度樟子松林分年蒸腾量约占年降水量的1/3,最多不超过55.0%。樟子松蒸腾能力(蒸腾强度与太阳辐射的比值)的年际变化总体上与由降水主导的从干变湿或由湿变干的水文年际变化趋势相符合,也与地下水位的年际变化规律基本吻合,但并不完全一致。
中图分类号:
韩辉,张学利,党宏忠,徐贵军,张晓,王斯彤,陈帅,张柏习. 科尔沁沙地南缘樟子松林蒸腾强度的年际变化及与降水、地下水位间的关系[J]. 林业科学, 2020, 56(11): 31-40.
Hui Han,Xueli Zhang,Hongzhong Dang,Guijun Xu,Xiao Zhang,Sitong Wang,Shuai Chen,Baixi Zhang. Inter-annual Variation of Transpiration Intensity of Pinus sylvestris var. mongolica Stand on the Southern Margin of Horqin Sandy Land and its Relationship with Precipitation and Groundwater Level[J]. Scientia Silvae Sinicae, 2020, 56(11): 31-40.
表1
樟子松树干液流观测样株基本情况"
观测时期 Measuring period | 样木株数 Samples | 天数 Days | 林龄 Stand ages | 样地林分密度 Stand density/ (stems·hm-2) | 平均胸径 DBH/ cm | 平均边材面积 Sapwood area/ cm2 | 活枝下高 Height of live branch/ m | 全树高 Tree height/ m | 冠幅(东-西×南-北) Crown breadth (direction E-W×N-S)/ m | 地下水位 Groundwater level/ m | 郁闭度 Canopy closure | 海拔 Altitude/ m |
2010-04-12—10-31 | 8 | 203 | 32 | 404 | 16.2 | 155.2 | 3.7 | 9.4 | 4.3×3.8 | -3.08 | 0.6 | 204.2 |
2011-04-17—10-31 | 8 | 214 | 33 | 404 | 16.7 | 164.7 | 3.7 | 9.55 | 4.4×3.9 | -2.93 | 0.6 | 204.2 |
2012-04-18—10-31 | 6 | 197 | 35 | 391 | 20.7 | 250.4 | 6.5 | 11.5 | 4.4×4.3 | -2.78 | 0.6 | 205.0 |
2013-04-26—10-31 | 4 | 189 | 35 | 560 | 20.7 | 250.4 | 4.3 | 10.4 | 5.0×4.8 | -2.38 | 0.9 | 206.1 |
2014-03-28—10-31 | 8 | 214 | 36 | 404 | 18.4 | 199.0 | 3.7 | 9.7 | 4.6×4.0 | -2.83 | 0.7 | 204.2 |
2015-04-02—10-31 | 4 | 213 | 37 | 290 | 18.6 | 203.3 | 4.1 | 9.85 | 4.7×4.1 | -2.94 | 0.6 | 207.2 |
2016-04-01—10-30 | 4 | 213 | 38 | 290 | 19.5 | 222.9 | 4.1 | 10.0 | 4.8×4.2 | -2.93 | 0.6 | 207.2 |
2017-04-01—10-29 | 4 | 212 | 39 | 290 | 20.0 | 234.2 | 4.1 | 10.10 | 4.9×4.5 | -3.03 | 0.6 | 207.2 |
2018-04-01—10-15 | 12 | 198 | 40 | 372 | 19.9 | 231.9 | 3.7 | 10.20 | 4.8×4.3 | -3.26 | 0.7 | 204.2 |
表2
不同年份樟子松蒸腾量及与降水量的比例"
变量 Variables | 年份 Year | 多年平均值 Mutiple-year averages | ||||||||
2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | ||
单株蒸腾强度 Transpiration intensity/ (kg·d-1stem-1) | 16.0±7.9 | 12.1±5.1 | 22.7±12.0 | 32.8±16.3 | 23.5±12.0 | 17.2±8.8 | 22.4±13.3 | 21.2±9.5 | 18.8±11.3 | 20.8±5.5 |
单株年蒸腾量 Transpiration/ (tonsy-1·stem-1) | 3.26 | 2.59 | 4.46 | 6.21 | 5.04 | 3.67 | 4.78 | 4.49 | 3.73 | 4.25 |
林分(参照密度)蒸腾强度 Stand transpiration/ (mm·d-1) | 0.65±0.33 | 0.52±0.23 | 0.63±0.36 | 0.98±0.51 | 0.98±0.50 | 0.74±0.38 | 0.89±0.50 | 0.83±0.38 | 0.84±0.50 | 0.86±0.31 |
林分(参照密度)年蒸腾量 Stand transpiration/ (mm·a-1) | 132.8 | 111.9 | 128.5 | 199.0 | 209.5 | 157.8 | 190.6 | 178.0 | 165.4 | 163.7 |
年降水量 Annual precipitation/mm | 689.2 | 354.0 | 772.6 | 605.6 | 382.8 | 432.7 | 637.4 | 346 | 457.1 | 519.7 |
年蒸腾/年降水 Ratio of annual transpiration to annual precipitation(%) | 19.3 | 31.6 | 16.6 | 32.9 | 54.7 | 36.5 | 29.8 | 51.5 | 36.2 | 31.5 |
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