The microclimatic factors of different width gaps, canopy and open land in the mixed forest of Pinus koraiensis broadleaf in Xiaoxing'anling were measured by HOBO automatic weather station for a period of one growing season.The results showed that the gaps and The diurnal variation of ground temperature and temperature and its variation trend in the growing season showed a single-peak curve, and the diurnal variation of the relative humidity of the gap and the control plot was higher in the morning and evening, The results showed that the relative humidity of the canopy was the largest, followed by the small, medium and large 3 gaps, and the open space was the smallest. The gap and the control The amount of precipitation and rainfall decreased with the increase of canopy layer, and the rainfall in the large gap was about 114 times that of the small gap. During the growing season, the open area, large, medium and small gap and the largest The wind speeds are 3134,2197,2187,2141 and 1184 m s-1, respectively.

HANDHELD NDVI MEASURING INSTRUMENT

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Reasonable application of nitrogen fertilizer is an important means of crop yield, but to determine how plants can use nitrogen fertilizer the most efficient way to determine the best time to fertilize, and time-consuming and laborious. The CM 1000 NDVI meter can help you quickly, promptly and efficiently understand the nitrogen content of the crop by measuring the normalized Vegetation Difference Index (NDVI) to obtain the necessary information.