| The petroleum pipeline underground in western areas of China results in temperature increase and affects the local crop planting. To determine its effect on crop yield, both field maize and maize for seed were sampled in Zhangye, Gansu. The sampling is located at the beginning spot(Tm. of pipeline : 28.5℃) of the compressor station of Zhangye, 10 km(Tm. of pipeline : 47.8℃) and 65 km(Tm. of pipeline : 45.2℃) from the western No.1 compressor station in Jiuquan and 1 km(Tm. of pipeline : 42.6℃) from western No.2 compressor station in Zhangye. We assigned 0 m, 5m and 10 m from the earth’s surface above the pipeline as T1, T2 and T3, respectively, 15 m as the control(CK). Rhizosphere soil and 10 maize seedling were sampled and 3 biological repeat were set to investigate the influence of pipeline on crop yield and rhizosphere soil nutrient in different spots and, eventually, give local planters reasonable advice to get their compensations.(1)Pipeline has a great effect on plant height and dry weight of roots, stems and leaves. At 28.5(maize for field experiment), T3 had greater plant height and stem dry weight than ℃T1, T2 and CK(2.78 m,64.62g), but CK had the greatest root and leaf dry weight(12.48 g,61g). At 47.8 ℃(maize for field experiment), CK had the greatest plant height and root stem leaf dry weight(2.79 m,13.68 g,65.24 g,59.83g).At 45.2 ℃(maize for seed), T3 also weighed more than any other treatments or the control in terms of plant height and leaf dry weight(1.54 m,38.62g),CK had the greatest root and stem dry weight(11.42 g,35.45g). At 42.6 ℃(maize for seed), T3 exceeded others in terms of root and stem dry weight(12.12 g,45.83g), as well as CK in terms of plant height and leaf dry weight(1.77 m,47.50g).(2)Pipeline also has great influence on economic yield. At the beginning spot of compressor station in Zhangye, maize yield is T1<T2<T3<CK with 12.1% decrease in T1 yield. 10 km from the compressor station of western No.1 line in Jiuquan, crop yield is T1<T2<CK<T3 with 26.0% in T1 yield; 60 km from the station, it was T1<T2<T3<CK with 24.5% decrease in T1 yield. 1 km from the station of western No.2 line in Zhangye, it was T1<T2<T3<CK with 23.2% decrease in T1 yield.(3)The pipeline has certain effect on rhizosphere soil nutrient. At 28.5℃, T3 had highest soil organic matter and rapidly-available phosphorus and CK had more total nitrogen and rapidly-available potassium than others. At 47.8℃, T3 had most total nitrogen, rapid-available phosphorus and potassium while CK exceeded others in terms of soil organic matter. At 45.2℃, T3 had highest rapidly-available phosphorus content while CK had the highest organic matter, total nitrogen and rapidly-available potassium. At 42.6℃,T1 had more rapidly-available potassium than others and T3 exceeded others when it came to total nitrogen. CK had more organic matter and rapidly-available phosphorus.In conclusion, the existence of pipeline has certain influence both on biological and economic output, as well as rhizosphere soil nutrient. |
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