Abstract: Three types (good, moderate, and bad) of sampling shelterbelt plots were chosen, based on the internal structure and growth conditions of the shelterbelts in the typical farmland shelterbelt regions-Yushu, Nong’an, Dehui and Fuyu in the western Jilin Province of Northeast China. The soil temperature and humidity, air temperature, and crop yields were observed. The farmland soil moisture content at the depths of 5 cm and 10 cm in good plots had somewhat increase comparing with that in bad plots, the increment being 1.03% and 0.89% in Dehui, 0.21% and 0.23% in Yushu, 1.48% and 1.42% in Fuyu, and 0.85% and 0.65% in Nong’an, respectively. In contrast, the maximal farmland soil temperature at the depths of 5 cm and 10 cm and the air temperature in good plots had somewhat decrease comparing with that in bad plots, the decrement being 1.42 ℃, 1.86 ℃ and 1.29 ℃ in Dehui,  0.89 ℃, 2.27 ℃ and 0.88 ℃ in Nong’an,  2.52 ℃, 3.93 ℃ and 0.95 ℃ in Yushu, and 1.6 ℃, 4 ℃ and 0.36 ℃in Fuyu, respectively. No significant difference was found in the crop yield between these two plots. In the study areas, shelterbelts played important roles in improving microclimates, increasing farmland
 soil moisture content, and decreasing the extent of temperature change.

Key words: Wheat, Leaf layer, Leaf water content, Plant water content, Reflectance spectra, Spectral index