Scientia Silvae Sinicae ›› 1999, Vol. 35 ›› Issue (zk): 54-65.
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Yubin Jia1,Yuxin Yuan1,Baohua Pei1,Deyi Wang1,Hongxia Wei2
Online:
Published:
Abstract:
Facing the present situation of a very large population, arid climate and the serious sand blow by the wind in the plain farming district of Hebei Province in China, we began to plant the fast growing and high yield forests of poplar intercropping with the crops in the sandy waste land where there was a serious sand, in the sandy beach, the second-class cultivated land and the middle-yield and low-yield land in the district from the early part of the eighties, which played an important part in developing and making full use of the land and light energy and increasing the green area and improving the agricultural ecological environment and so on in the district.Temporal and space distribution of microclimate elements, such as temperature, humidity, wind and evaporation, and its effects were analyzed in the poplar-crop intercropping field with different patterns based on the observation data from 1993 to 1997 by artificial and auto meteorological instrument.The results showed that the efficacy of poplar intercropping with crops to prevent wind was 45 %~ 87 %, the average value was 57 %.The poplar-crop intercropping could decrease daily maximal air temperature from 0.3 ℃ to 3.4 ℃ , with an average of 1.3 ℃ .The daily mean maximal temperature of earth surface could be reduced 6 ℃ by means of the poplar intercropping with crops, the maximal temperature reduced was 19.5 ℃ .The daily mean absolute humidity was increased 0.9 hPa~ 2.4 hPa with an average of 1.4 hPa, and the daily mean relative humidity was increased 1%~ 13 %, averaged in 5 %.The water evaporation was decreased from 17 % to 36 %, averaged in 25 %.the poplar intercropping with crop could make the continued time of the relative humidity < 30 %short 4.5 h on a dry hot wind day.Therefore, the poplar intercropping with crops has the obvious functions of wind-proof, dropping temperature, increasing humidity, and decreasing evaporation, which have significance for improving the field micro-climate and ecological environment of agriculture, and promoting high-yield and stable-yield of agriculture.
Key words: Intercropping poplar with crops, Ecology environment, Microclimate effects, Drought, Wind-Sand, Wind erosion
Yubin Jia,Yuxin Yuan,Baohua Pei,Deyi Wang,Hongxia Wei. THE POPLAR INTERCROPPING WITH CROPS IMPROVING ECOLOGICAL ENVIRONMENT IN THE FARMLAND[J]. Scientia Silvae Sinicae, 1999, 35(zk): 54-65.
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Table 1
The situation of climate and soil on test areas"
Table 2
Poplar spacing and growth condition in the intercropping test areas"
Fig.1
Daily variation of wind speed"
Fig.2
Windproof effect of poplar-crops intercropping"
Fig.3
Table 3
The windproof effect of different patterns of intercropping fields"
Fig.4
Effect of poplar-crops intercropping on decreasing windspeed"
Fig.5
Daily variation of air temperature"
Fig.6
Daily variation in air temperature of area between rows and under crown"
Table 4
The effects of different intercropping patterns on air temperature"
Fig.7
Daily variation of ground temperature"
Fig.8
Table 5
The effects of different intercropping models on ground temperature"
Fig.9
Daily variation of absolute humidity on a sunny day"
Fig.10
Daily variation of relative humidity on a sunny day"
Fig.11
Daily variation of relative humidity on a cloudy day"
Fig.12
Daily variation of relative humidity on a dry hot wind day"
Table 6
The effects of different intercropping patterns on absolute humidity"
Table 7
The effects of different intercropping model on relative humidity"
Table 8
The effects of different intercropping model on evaporation"
Fig.13
Daily variation of air temperature on a dry hot wind day"
Fig.14
Daily variation of wind speed on a dry hot wind day"
Table 9
The condition of air temperature, humidity and wind-speed on a dry hot wind day"
Table 10
The production of different poplar-crop intercropping models"