| Mulberry shoots were planted in the plain sandlot and hill terrace in the eastern of Hebeiprovince, and they were mainly intercropped by peanut and maize. The structurecharacteristics of biomass and spatial distribution rule of root system of mulberry shootswere systemic investigated in the sandlot and terrace in Qian'an, meanwhile, the potentialimpact on soil physical and chemical property were discussed,and the influence onmicroclimate was studied as well. The results would show the acclimation of mulberryshoots to the aridity and the ecological and economical benefits of mulberry shoots, andprovide basic date for the design and feasibility of plantation. The results were as follows:(1) The aboveground biomass of mulberry shoots in the sandlot was higher than it in theterrace. Aboveground biomass of individual distributed mainly less than 160 cm of thestem, and the stem accounted for the most. The biomass of leaves (＞160cm) were higherthan the stems, the biomass from 80 cm to 160 cm accounted for the important part. At thetwo site condition the Leaves moisture contents were almost as much as the branchesmoisture contents. The relationship between basic diameter and height had a goodquadratic, and their correction coefficients were remarkably.(2) Root distribution of Mulberry Shoots and its influence on soil moisture and nutrientin Qian'an were studied.The results showed that: the weight of the roots in the 20～40 cmsoil layer were 60％～80％of the total amounts, and distributed decreasingly with the depthincreasing. The hairy roots (diameter＜3 mm) were 30％～40％of the total amounts,concentrating in the 20～40 cm soil layer. The roots (diameter＞7 mm) were the least andonly 15％of the total amounts. The horizontal distribution mainly concentrated in thecluster of 0～100 cm from the center of Mulberry Shoots cluster in the plain sandlot. Theweight of roots in the 100 cm soil layer from the cluster was 6.25％of the total amounts.The root vertical distribution could reach up to 3.28 m in depth, and some roots embed thedeep soil layer where the horizontal distribution range was little, but the horizontaldistribution was obvious in the hill terrace. The roots horizontal distribution could reach to250 cm in width with few roots embed the rock. The roots weight, diameter and sectionarea distribute characteristics of Mulberry Shoots were different according to site conditionand the depth of the soil.(3) The soil bulk density of the upside was lower in the pure sandlot farmland, and thatof downside was higher. However, the soil bulk density of the middle in the intercropping field was lower, but the two sides were higher. In the different soil layers the middle grit(1～0.25mm) and fine grit (0.25～0.1mm) were in the majority. Clay and 0.05～0.001 mmparticles content were less than 10％. Planting mulberry shoots could decrease the middlegrit (1～0.25mm) content in the surface layer, and the soil particle could become finer.Where there were many roots of mulberry shoots, and where there were much clay and0.05～0.001 mm particles. The soil was thick in the hill terrace, and the soil buck densityincreased with the soil layer increasing. The stone and particles (＜0.5mm) content werehigher in the terrace soil. The deep soil moisture could be increased. There were notobvious moisture deficits in the horizontal range near the cluster. The infiltration capacityof upside-bank soil was the best, and it of middle-bank soil was the worst. The soil nutrientnear the cluster could be improved by the mulberry shoots.(4) Mulberry shoots, which the leaves were used for rearing, the shoots were used forknitting, was an excellent agro-forestry intercropping shrub. The roots of the mulberryshoots played an important role in sand-fixing. The microclimate factors (wind speed, lightintensity, soil surface temperature, and air temperature) in the intercropping field andcontrol plot were compared. The Mulberry shoots and peanut were planted in theintercropping field, but only peanut were planted in the control plot. The results showedthat: Wind speed decreased sharply in the intercropping field var. control plot. Thediscrepancy of wind speed in the intercropping field where the distances of Mulberryshoots range were 8 m and 13 m was not distinct. The differences of light intensity amongintercropping field and control plot were not distinct. The air temperature, soil surfacetemperature and crop layer temperature in the intercropping field were smaller than controlplot and relative steady. The relative humidity in the intercropping fields was higher thancontrol plot.(5) The peanut biomass and height of plants in the intercropping field and pure field inthe sandlot were higher than those in the terrace. Planting mulberry shoots could increasethe biomass and yield of peanut.
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